2 * of-thermal.c - Generic Thermal Management device tree support.
4 * Copyright (C) 2013 Texas Instruments
5 * Copyright (C) 2013 Eduardo Valentin <eduardo.valentin@ti.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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 #include <linux/thermal.h>
26 #include <linux/slab.h>
27 #include <linux/types.h>
28 #include <linux/of_device.h>
29 #include <linux/of_platform.h>
30 #include <linux/err.h>
31 #include <linux/export.h>
32 #include <linux/string.h>
33 #include <linux/thermal.h>
35 #include "thermal_core.h"
37 /*** Private data structures to represent thermal device tree data ***/
40 * struct __thermal_bind_param - a match between trip and cooling device
41 * @cooling_device: a pointer to identify the referred cooling device
42 * @trip_id: the trip point index
43 * @usage: the percentage (from 0 to 100) of cooling contribution
44 * @min: minimum cooling state used at this trip point
45 * @max: maximum cooling state used at this trip point
48 struct __thermal_bind_params {
49 struct device_node *cooling_device;
57 * struct __thermal_zone - internal representation of a thermal zone
58 * @mode: current thermal zone device mode (enabled/disabled)
59 * @passive_delay: polling interval while passive cooling is activated
60 * @polling_delay: zone polling interval
61 * @slope: slope of the temperature adjustment curve
62 * @offset: offset of the temperature adjustment curve
63 * @ntrips: number of trip points
64 * @trips: an array of trip points (0..ntrips - 1)
65 * @num_tbps: number of thermal bind params
66 * @tbps: an array of thermal bind params (0..num_tbps - 1)
67 * @sensor_data: sensor private data used while reading temperature and trend
68 * @ops: set of callbacks to handle the thermal zone based on DT
71 struct __thermal_zone {
72 enum thermal_device_mode mode;
80 struct thermal_trip *trips;
82 /* cooling binding data */
84 struct __thermal_bind_params *tbps;
86 /* sensor interface */
88 const struct thermal_zone_of_device_ops *ops;
91 /*** DT thermal zone device callbacks ***/
93 static int of_thermal_get_temp(struct thermal_zone_device *tz,
96 struct __thermal_zone *data = tz->devdata;
98 if (!data->ops->get_temp)
101 return data->ops->get_temp(data->sensor_data, temp);
104 static int of_thermal_set_trips(struct thermal_zone_device *tz,
107 struct __thermal_zone *data = tz->devdata;
109 if (!data->ops || !data->ops->set_trips)
112 return data->ops->set_trips(data->sensor_data, low, high);
116 * of_thermal_get_ntrips - function to export number of available trip
118 * @tz: pointer to a thermal zone
120 * This function is a globally visible wrapper to get number of trip points
121 * stored in the local struct __thermal_zone
123 * Return: number of available trip points, -ENODEV when data not available
125 int of_thermal_get_ntrips(struct thermal_zone_device *tz)
127 struct __thermal_zone *data = tz->devdata;
129 if (!data || IS_ERR(data))
134 EXPORT_SYMBOL_GPL(of_thermal_get_ntrips);
137 * of_thermal_is_trip_valid - function to check if trip point is valid
139 * @tz: pointer to a thermal zone
140 * @trip: trip point to evaluate
142 * This function is responsible for checking if passed trip point is valid
144 * Return: true if trip point is valid, false otherwise
146 bool of_thermal_is_trip_valid(struct thermal_zone_device *tz, int trip)
148 struct __thermal_zone *data = tz->devdata;
150 if (!data || trip >= data->ntrips || trip < 0)
155 EXPORT_SYMBOL_GPL(of_thermal_is_trip_valid);
158 * of_thermal_get_trip_points - function to get access to a globally exported
161 * @tz: pointer to a thermal zone
163 * This function provides a pointer to trip points table
165 * Return: pointer to trip points table, NULL otherwise
167 const struct thermal_trip *
168 of_thermal_get_trip_points(struct thermal_zone_device *tz)
170 struct __thermal_zone *data = tz->devdata;
177 EXPORT_SYMBOL_GPL(of_thermal_get_trip_points);
180 * of_thermal_set_emul_temp - function to set emulated temperature
182 * @tz: pointer to a thermal zone
183 * @temp: temperature to set
185 * This function gives the ability to set emulated value of temperature,
186 * which is handy for debugging
188 * Return: zero on success, error code otherwise
190 static int of_thermal_set_emul_temp(struct thermal_zone_device *tz,
193 struct __thermal_zone *data = tz->devdata;
195 if (!data->ops || !data->ops->set_emul_temp)
198 return data->ops->set_emul_temp(data->sensor_data, temp);
201 static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip,
202 enum thermal_trend *trend)
204 struct __thermal_zone *data = tz->devdata;
207 if (!data->ops->get_trend)
210 r = data->ops->get_trend(data->sensor_data, trip, trend);
217 static int of_thermal_bind(struct thermal_zone_device *thermal,
218 struct thermal_cooling_device *cdev)
220 struct __thermal_zone *data = thermal->devdata;
223 if (!data || IS_ERR(data))
226 /* find where to bind */
227 for (i = 0; i < data->num_tbps; i++) {
228 struct __thermal_bind_params *tbp = data->tbps + i;
230 if (tbp->cooling_device == cdev->np) {
233 ret = thermal_zone_bind_cooling_device(thermal,
246 static int of_thermal_unbind(struct thermal_zone_device *thermal,
247 struct thermal_cooling_device *cdev)
249 struct __thermal_zone *data = thermal->devdata;
252 if (!data || IS_ERR(data))
255 /* find where to unbind */
256 for (i = 0; i < data->num_tbps; i++) {
257 struct __thermal_bind_params *tbp = data->tbps + i;
259 if (tbp->cooling_device == cdev->np) {
262 ret = thermal_zone_unbind_cooling_device(thermal,
272 static int of_thermal_get_mode(struct thermal_zone_device *tz,
273 enum thermal_device_mode *mode)
275 struct __thermal_zone *data = tz->devdata;
282 static int of_thermal_set_mode(struct thermal_zone_device *tz,
283 enum thermal_device_mode mode)
285 struct __thermal_zone *data = tz->devdata;
287 mutex_lock(&tz->lock);
289 if (mode == THERMAL_DEVICE_ENABLED)
290 tz->polling_delay = data->polling_delay;
292 tz->polling_delay = 0;
294 mutex_unlock(&tz->lock);
297 thermal_zone_device_update(tz);
302 static int of_thermal_get_trip_type(struct thermal_zone_device *tz, int trip,
303 enum thermal_trip_type *type)
305 struct __thermal_zone *data = tz->devdata;
307 if (trip >= data->ntrips || trip < 0)
310 *type = data->trips[trip].type;
315 static int of_thermal_get_trip_temp(struct thermal_zone_device *tz, int trip,
318 struct __thermal_zone *data = tz->devdata;
320 if (trip >= data->ntrips || trip < 0)
323 *temp = data->trips[trip].temperature;
328 static int of_thermal_set_trip_temp(struct thermal_zone_device *tz, int trip,
331 struct __thermal_zone *data = tz->devdata;
333 if (trip >= data->ntrips || trip < 0)
336 if (data->ops->set_trip_temp) {
339 ret = data->ops->set_trip_temp(data->sensor_data, trip, temp);
344 /* thermal framework should take care of data->mask & (1 << trip) */
345 data->trips[trip].temperature = temp;
350 static int of_thermal_get_trip_hyst(struct thermal_zone_device *tz, int trip,
353 struct __thermal_zone *data = tz->devdata;
355 if (trip >= data->ntrips || trip < 0)
358 *hyst = data->trips[trip].hysteresis;
363 static int of_thermal_set_trip_hyst(struct thermal_zone_device *tz, int trip,
366 struct __thermal_zone *data = tz->devdata;
368 if (trip >= data->ntrips || trip < 0)
371 /* thermal framework should take care of data->mask & (1 << trip) */
372 data->trips[trip].hysteresis = hyst;
377 static int of_thermal_get_crit_temp(struct thermal_zone_device *tz,
380 struct __thermal_zone *data = tz->devdata;
383 for (i = 0; i < data->ntrips; i++)
384 if (data->trips[i].type == THERMAL_TRIP_CRITICAL) {
385 *temp = data->trips[i].temperature;
392 static struct thermal_zone_device_ops of_thermal_ops = {
393 .get_mode = of_thermal_get_mode,
394 .set_mode = of_thermal_set_mode,
396 .get_trip_type = of_thermal_get_trip_type,
397 .get_trip_temp = of_thermal_get_trip_temp,
398 .set_trip_temp = of_thermal_set_trip_temp,
399 .get_trip_hyst = of_thermal_get_trip_hyst,
400 .set_trip_hyst = of_thermal_set_trip_hyst,
401 .get_crit_temp = of_thermal_get_crit_temp,
403 .bind = of_thermal_bind,
404 .unbind = of_thermal_unbind,
409 static struct thermal_zone_device *
410 thermal_zone_of_add_sensor(struct device_node *zone,
411 struct device_node *sensor, void *data,
412 const struct thermal_zone_of_device_ops *ops)
414 struct thermal_zone_device *tzd;
415 struct __thermal_zone *tz;
417 tzd = thermal_zone_get_zone_by_name(zone->name);
419 return ERR_PTR(-EPROBE_DEFER);
424 return ERR_PTR(-EINVAL);
426 mutex_lock(&tzd->lock);
428 tz->sensor_data = data;
430 tzd->ops->get_temp = of_thermal_get_temp;
431 tzd->ops->get_trend = of_thermal_get_trend;
432 tzd->ops->set_trips = of_thermal_set_trips;
433 tzd->ops->set_emul_temp = of_thermal_set_emul_temp;
434 mutex_unlock(&tzd->lock);
440 * thermal_zone_of_sensor_register - registers a sensor to a DT thermal zone
441 * @dev: a valid struct device pointer of a sensor device. Must contain
442 * a valid .of_node, for the sensor node.
443 * @sensor_id: a sensor identifier, in case the sensor IP has more
445 * @data: a private pointer (owned by the caller) that will be passed
446 * back, when a temperature reading is needed.
447 * @ops: struct thermal_zone_of_device_ops *. Must contain at least .get_temp.
449 * This function will search the list of thermal zones described in device
450 * tree and look for the zone that refer to the sensor device pointed by
451 * @dev->of_node as temperature providers. For the zone pointing to the
452 * sensor node, the sensor will be added to the DT thermal zone device.
454 * The thermal zone temperature is provided by the @get_temp function
455 * pointer. When called, it will have the private pointer @data back.
457 * The thermal zone temperature trend is provided by the @get_trend function
458 * pointer. When called, it will have the private pointer @data back.
461 * 01 - This function must enqueue the new sensor instead of using
462 * it as the only source of temperature values.
464 * 02 - There must be a way to match the sensor with all thermal zones
467 * Return: On success returns a valid struct thermal_zone_device,
468 * otherwise, it returns a corresponding ERR_PTR(). Caller must
469 * check the return value with help of IS_ERR() helper.
471 struct thermal_zone_device *
472 thermal_zone_of_sensor_register(struct device *dev, int sensor_id, void *data,
473 const struct thermal_zone_of_device_ops *ops)
475 struct device_node *np, *child, *sensor_np;
476 struct thermal_zone_device *tzd = ERR_PTR(-ENODEV);
478 np = of_find_node_by_name(NULL, "thermal-zones");
480 return ERR_PTR(-ENODEV);
482 if (!dev || !dev->of_node) {
484 return ERR_PTR(-EINVAL);
487 sensor_np = of_node_get(dev->of_node);
489 for_each_child_of_node(np, child) {
490 struct of_phandle_args sensor_specs;
493 /* Check whether child is enabled or not */
494 if (!of_device_is_available(child))
497 /* For now, thermal framework supports only 1 sensor per zone */
498 ret = of_parse_phandle_with_args(child, "thermal-sensors",
499 "#thermal-sensor-cells",
504 if (sensor_specs.args_count >= 1) {
505 id = sensor_specs.args[0];
506 WARN(sensor_specs.args_count > 1,
507 "%s: too many cells in sensor specifier %d\n",
508 sensor_specs.np->name, sensor_specs.args_count);
513 if (sensor_specs.np == sensor_np && id == sensor_id) {
514 tzd = thermal_zone_of_add_sensor(child, sensor_np,
517 tzd->ops->set_mode(tzd, THERMAL_DEVICE_ENABLED);
519 of_node_put(sensor_specs.np);
523 of_node_put(sensor_specs.np);
526 of_node_put(sensor_np);
531 EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_register);
534 * thermal_zone_of_sensor_unregister - unregisters a sensor from a DT thermal zone
535 * @dev: a valid struct device pointer of a sensor device. Must contain
536 * a valid .of_node, for the sensor node.
537 * @tzd: a pointer to struct thermal_zone_device where the sensor is registered.
539 * This function removes the sensor callbacks and private data from the
540 * thermal zone device registered with thermal_zone_of_sensor_register()
541 * API. It will also silent the zone by remove the .get_temp() and .get_trend()
542 * thermal zone device callbacks.
544 * TODO: When the support to several sensors per zone is added, this
545 * function must search the sensor list based on @dev parameter.
548 void thermal_zone_of_sensor_unregister(struct device *dev,
549 struct thermal_zone_device *tzd)
551 struct __thermal_zone *tz;
553 if (!dev || !tzd || !tzd->devdata)
558 /* no __thermal_zone, nothing to be done */
562 mutex_lock(&tzd->lock);
563 tzd->ops->get_temp = NULL;
564 tzd->ops->get_trend = NULL;
565 tzd->ops->set_emul_temp = NULL;
568 tz->sensor_data = NULL;
569 mutex_unlock(&tzd->lock);
571 EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_unregister);
573 static void devm_thermal_zone_of_sensor_release(struct device *dev, void *res)
575 thermal_zone_of_sensor_unregister(dev,
576 *(struct thermal_zone_device **)res);
579 static int devm_thermal_zone_of_sensor_match(struct device *dev, void *res,
582 struct thermal_zone_device **r = res;
584 if (WARN_ON(!r || !*r))
591 * devm_thermal_zone_of_sensor_register - Resource managed version of
592 * thermal_zone_of_sensor_register()
593 * @dev: a valid struct device pointer of a sensor device. Must contain
594 * a valid .of_node, for the sensor node.
595 * @sensor_id: a sensor identifier, in case the sensor IP has more
597 * @data: a private pointer (owned by the caller) that will be passed
598 * back, when a temperature reading is needed.
599 * @ops: struct thermal_zone_of_device_ops *. Must contain at least .get_temp.
601 * Refer thermal_zone_of_sensor_register() for more details.
603 * Return: On success returns a valid struct thermal_zone_device,
604 * otherwise, it returns a corresponding ERR_PTR(). Caller must
605 * check the return value with help of IS_ERR() helper.
606 * Registered hermal_zone_device device will automatically be
607 * released when device is unbounded.
609 struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
610 struct device *dev, int sensor_id,
611 void *data, const struct thermal_zone_of_device_ops *ops)
613 struct thermal_zone_device **ptr, *tzd;
615 ptr = devres_alloc(devm_thermal_zone_of_sensor_release, sizeof(*ptr),
618 return ERR_PTR(-ENOMEM);
620 tzd = thermal_zone_of_sensor_register(dev, sensor_id, data, ops);
627 devres_add(dev, ptr);
631 EXPORT_SYMBOL_GPL(devm_thermal_zone_of_sensor_register);
634 * devm_thermal_zone_of_sensor_unregister - Resource managed version of
635 * thermal_zone_of_sensor_unregister().
636 * @dev: Device for which which resource was allocated.
637 * @tzd: a pointer to struct thermal_zone_device where the sensor is registered.
639 * This function removes the sensor callbacks and private data from the
640 * thermal zone device registered with devm_thermal_zone_of_sensor_register()
641 * API. It will also silent the zone by remove the .get_temp() and .get_trend()
642 * thermal zone device callbacks.
643 * Normally this function will not need to be called and the resource
644 * management code will ensure that the resource is freed.
646 void devm_thermal_zone_of_sensor_unregister(struct device *dev,
647 struct thermal_zone_device *tzd)
649 WARN_ON(devres_release(dev, devm_thermal_zone_of_sensor_release,
650 devm_thermal_zone_of_sensor_match, tzd));
652 EXPORT_SYMBOL_GPL(devm_thermal_zone_of_sensor_unregister);
654 /*** functions parsing device tree nodes ***/
657 * thermal_of_populate_bind_params - parse and fill cooling map data
658 * @np: DT node containing a cooling-map node
659 * @__tbp: data structure to be filled with cooling map info
660 * @trips: array of thermal zone trip points
661 * @ntrips: number of trip points inside trips.
663 * This function parses a cooling-map type of node represented by
664 * @np parameter and fills the read data into @__tbp data structure.
665 * It needs the already parsed array of trip points of the thermal zone
668 * Return: 0 on success, proper error code otherwise
670 static int thermal_of_populate_bind_params(struct device_node *np,
671 struct __thermal_bind_params *__tbp,
672 struct thermal_trip *trips,
675 struct of_phandle_args cooling_spec;
676 struct device_node *trip;
680 /* Default weight. Usage is optional */
681 __tbp->usage = THERMAL_WEIGHT_DEFAULT;
682 ret = of_property_read_u32(np, "contribution", &prop);
686 trip = of_parse_phandle(np, "trip", 0);
688 pr_err("missing trip property\n");
692 /* match using device_node */
693 for (i = 0; i < ntrips; i++)
694 if (trip == trips[i].np) {
704 ret = of_parse_phandle_with_args(np, "cooling-device", "#cooling-cells",
707 pr_err("missing cooling_device property\n");
710 __tbp->cooling_device = cooling_spec.np;
711 if (cooling_spec.args_count >= 2) { /* at least min and max */
712 __tbp->min = cooling_spec.args[0];
713 __tbp->max = cooling_spec.args[1];
715 pr_err("wrong reference to cooling device, missing limits\n");
725 * It maps 'enum thermal_trip_type' found in include/linux/thermal.h
726 * into the device tree binding of 'trip', property type.
728 static const char * const trip_types[] = {
729 [THERMAL_TRIP_ACTIVE] = "active",
730 [THERMAL_TRIP_PASSIVE] = "passive",
731 [THERMAL_TRIP_HOT] = "hot",
732 [THERMAL_TRIP_CRITICAL] = "critical",
736 * thermal_of_get_trip_type - Get phy mode for given device_node
737 * @np: Pointer to the given device_node
738 * @type: Pointer to resulting trip type
740 * The function gets trip type string from property 'type',
741 * and store its index in trip_types table in @type,
743 * Return: 0 on success, or errno in error case.
745 static int thermal_of_get_trip_type(struct device_node *np,
746 enum thermal_trip_type *type)
751 err = of_property_read_string(np, "type", &t);
755 for (i = 0; i < ARRAY_SIZE(trip_types); i++)
756 if (!strcasecmp(t, trip_types[i])) {
765 * thermal_of_populate_trip - parse and fill one trip point data
766 * @np: DT node containing a trip point node
767 * @trip: trip point data structure to be filled up
769 * This function parses a trip point type of node represented by
770 * @np parameter and fills the read data into @trip data structure.
772 * Return: 0 on success, proper error code otherwise
774 static int thermal_of_populate_trip(struct device_node *np,
775 struct thermal_trip *trip)
780 ret = of_property_read_u32(np, "temperature", &prop);
782 pr_err("missing temperature property\n");
785 trip->temperature = prop;
787 ret = of_property_read_u32(np, "hysteresis", &prop);
789 pr_err("missing hysteresis property\n");
792 trip->hysteresis = prop;
794 ret = thermal_of_get_trip_type(np, &trip->type);
796 pr_err("wrong trip type property\n");
800 /* Required for cooling map matching */
808 * thermal_of_build_thermal_zone - parse and fill one thermal zone data
809 * @np: DT node containing a thermal zone node
811 * This function parses a thermal zone type of node represented by
812 * @np parameter and fills the read data into a __thermal_zone data structure
813 * and return this pointer.
815 * TODO: Missing properties to parse: thermal-sensor-names
817 * Return: On success returns a valid struct __thermal_zone,
818 * otherwise, it returns a corresponding ERR_PTR(). Caller must
819 * check the return value with help of IS_ERR() helper.
821 static struct __thermal_zone *
822 thermal_of_build_thermal_zone(struct device_node *np)
824 struct device_node *child = NULL, *gchild;
825 struct __thermal_zone *tz;
830 pr_err("no thermal zone np\n");
831 return ERR_PTR(-EINVAL);
834 tz = kzalloc(sizeof(*tz), GFP_KERNEL);
836 return ERR_PTR(-ENOMEM);
838 ret = of_property_read_u32(np, "polling-delay-passive", &prop);
840 pr_err("missing polling-delay-passive property\n");
843 tz->passive_delay = prop;
845 ret = of_property_read_u32(np, "polling-delay", &prop);
847 pr_err("missing polling-delay property\n");
850 tz->polling_delay = prop;
853 * REVIST: for now, the thermal framework supports only
854 * one sensor per thermal zone. Thus, we are considering
855 * only the first two values as slope and offset.
857 ret = of_property_read_u32_array(np, "coefficients", coef, 2);
860 tz->offset = coef[1];
867 child = of_get_child_by_name(np, "trips");
869 /* No trips provided */
873 tz->ntrips = of_get_child_count(child);
874 if (tz->ntrips == 0) /* must have at least one child */
877 tz->trips = kzalloc(tz->ntrips * sizeof(*tz->trips), GFP_KERNEL);
884 for_each_child_of_node(child, gchild) {
885 ret = thermal_of_populate_trip(gchild, &tz->trips[i++]);
893 child = of_get_child_by_name(np, "cooling-maps");
895 /* cooling-maps not provided */
899 tz->num_tbps = of_get_child_count(child);
900 if (tz->num_tbps == 0)
903 tz->tbps = kzalloc(tz->num_tbps * sizeof(*tz->tbps), GFP_KERNEL);
910 for_each_child_of_node(child, gchild) {
911 ret = thermal_of_populate_bind_params(gchild, &tz->tbps[i++],
912 tz->trips, tz->ntrips);
919 tz->mode = THERMAL_DEVICE_DISABLED;
924 for (i = 0; i < tz->num_tbps; i++)
925 of_node_put(tz->tbps[i].cooling_device);
928 for (i = 0; i < tz->ntrips; i++)
929 of_node_put(tz->trips[i].np);
939 static inline void of_thermal_free_zone(struct __thermal_zone *tz)
943 for (i = 0; i < tz->num_tbps; i++)
944 of_node_put(tz->tbps[i].cooling_device);
946 for (i = 0; i < tz->ntrips; i++)
947 of_node_put(tz->trips[i].np);
953 * of_parse_thermal_zones - parse device tree thermal data
955 * Initialization function that can be called by machine initialization
956 * code to parse thermal data and populate the thermal framework
957 * with hardware thermal zones info. This function only parses thermal zones.
958 * Cooling devices and sensor devices nodes are supposed to be parsed
959 * by their respective drivers.
961 * Return: 0 on success, proper error code otherwise
964 int __init of_parse_thermal_zones(void)
966 struct device_node *np, *child;
967 struct __thermal_zone *tz;
968 struct thermal_zone_device_ops *ops;
970 np = of_find_node_by_name(NULL, "thermal-zones");
972 pr_debug("unable to find thermal zones\n");
973 return 0; /* Run successfully on systems without thermal DT */
976 for_each_child_of_node(np, child) {
977 struct thermal_zone_device *zone;
978 struct thermal_zone_params *tzp;
982 /* Check whether child is enabled or not */
983 if (!of_device_is_available(child))
986 tz = thermal_of_build_thermal_zone(child);
988 pr_err("failed to build thermal zone %s: %ld\n",
994 ops = kmemdup(&of_thermal_ops, sizeof(*ops), GFP_KERNEL);
998 tzp = kzalloc(sizeof(*tzp), GFP_KERNEL);
1004 /* No hwmon because there might be hwmon drivers registering */
1005 tzp->no_hwmon = true;
1007 if (!of_property_read_u32(child, "sustainable-power", &prop))
1008 tzp->sustainable_power = prop;
1010 for (i = 0; i < tz->ntrips; i++)
1013 /* these two are left for temperature drivers to use */
1014 tzp->slope = tz->slope;
1015 tzp->offset = tz->offset;
1017 zone = thermal_zone_device_register(child->name, tz->ntrips,
1023 pr_err("Failed to build %s zone %ld\n", child->name,
1027 of_thermal_free_zone(tz);
1028 /* attempting to build remaining zones still */
1038 of_thermal_free_zone(tz);
1040 /* no memory available, so free what we have built */
1041 of_thermal_destroy_zones();
1047 * of_thermal_destroy_zones - remove all zones parsed and allocated resources
1049 * Finds all zones parsed and added to the thermal framework and remove them
1050 * from the system, together with their resources.
1053 void of_thermal_destroy_zones(void)
1055 struct device_node *np, *child;
1057 np = of_find_node_by_name(NULL, "thermal-zones");
1059 pr_debug("unable to find thermal zones\n");
1063 for_each_child_of_node(np, child) {
1064 struct thermal_zone_device *zone;
1066 /* Check whether child is enabled or not */
1067 if (!of_device_is_available(child))
1070 zone = thermal_zone_get_zone_by_name(child->name);
1074 thermal_zone_device_unregister(zone);
1077 of_thermal_free_zone(zone->devdata);