Merge branch 'thermal-core'

Merge additional thermal core and ACPI thermal changes for 6.4-rc1:

 - Clean up the step-wise thermal governor (Zhang Rui).

 - Introduce thermal_zone_device() for accessing the device field of
   struct thermal_zone_device and two drivers use it (Daniel Lezcano).

 - Clean up the ACPI thermal driver a bit (Daniel Lezcano).

 - Delete the thermal driver for Intel Menlow platforms that is not
   expected to have any users (Rafael Wysocki).

* thermal-core:
  thermal: intel: menlow: Get rid of this driver
  ACPI: thermal: Move to dedicated function sysfs extra attr creation
  ACPI: thermal: Use thermal_zone_device()
  thermal: intel: pch_thermal: Use thermal driver device to write a trace
  thermal: core: Encapsulate tz->device field
  thermal: gov_step_wise: Adjust code logic to match comment
  thermal: gov_step_wise: Delete obsolete comment

drivers/acpi/thermal.c

@@ -787,6 +787,32 @@ static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 	.critical = acpi_thermal_zone_device_critical,
 };
 
+static int acpi_thermal_zone_sysfs_add(struct acpi_thermal *tz)
+{
+	struct device *tzdev = thermal_zone_device(tz->thermal_zone);
+	int ret;
+
+	ret = sysfs_create_link(&tz->device->dev.kobj,
+				&tzdev->kobj, "thermal_zone");
+	if (ret)
+		return ret;
+
+	ret = sysfs_create_link(&tzdev->kobj,
+				   &tz->device->dev.kobj, "device");
+	if (ret)
+		sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
+
+	return ret;
+}
+
+static void acpi_thermal_zone_sysfs_remove(struct acpi_thermal *tz)
+{
+	struct device *tzdev = thermal_zone_device(tz->thermal_zone);
+
+	sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
+	sysfs_remove_link(&tzdev->kobj, "device");
+}
+
 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 {
 	int trips = 0;
@@ -820,21 +846,15 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 	if (IS_ERR(tz->thermal_zone))
 		return -ENODEV;
 
-	result = sysfs_create_link(&tz->device->dev.kobj,
-				   &tz->thermal_zone->device.kobj, "thermal_zone");
+	result = acpi_thermal_zone_sysfs_add(tz);
 	if (result)
 		goto unregister_tzd;
 
-	result = sysfs_create_link(&tz->thermal_zone->device.kobj,
-				   &tz->device->dev.kobj, "device");
-	if (result)
-		goto remove_tz_link;
-
 	status =  acpi_bus_attach_private_data(tz->device->handle,
 					       tz->thermal_zone);
 	if (ACPI_FAILURE(status)) {
 		result = -ENODEV;
-		goto remove_dev_link;
+		goto remove_links;
 	}
 
 	result = thermal_zone_device_enable(tz->thermal_zone);
@@ -848,10 +868,8 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 
 acpi_bus_detach:
 	acpi_bus_detach_private_data(tz->device->handle);
-remove_dev_link:
-	sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
-remove_tz_link:
-	sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
+remove_links:
+	acpi_thermal_zone_sysfs_remove(tz);
 unregister_tzd:
 	thermal_zone_device_unregister(tz->thermal_zone);
 
@@ -860,8 +878,7 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 
 static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
 {
-	sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
-	sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
+	acpi_thermal_zone_sysfs_remove(tz);
 	thermal_zone_device_unregister(tz->thermal_zone);
 	tz->thermal_zone = NULL;
 	acpi_bus_detach_private_data(tz->device->handle);

drivers/thermal/gov_step_wise.c

@@ -21,19 +21,11 @@
  *    a. if the trend is THERMAL_TREND_RAISING, use higher cooling
  *       state for this trip point
  *    b. if the trend is THERMAL_TREND_DROPPING, do nothing
- *    c. if the trend is THERMAL_TREND_RAISE_FULL, use upper limit
- *       for this trip point
- *    d. if the trend is THERMAL_TREND_DROP_FULL, use lower limit
- *       for this trip point
  * If the temperature is lower than a trip point,
  *    a. if the trend is THERMAL_TREND_RAISING, do nothing
  *    b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
  *       state for this trip point, if the cooling state already
  *       equals lower limit, deactivate the thermal instance
- *    c. if the trend is THERMAL_TREND_RAISE_FULL, do nothing
- *    d. if the trend is THERMAL_TREND_DROP_FULL, use lower limit,
- *       if the cooling state already equals lower limit,
- *       deactivate the thermal instance
  */
 static unsigned long get_target_state(struct thermal_instance *instance,
 				enum thermal_trend trend, bool throttle)
@@ -61,24 +53,16 @@ static unsigned long get_target_state(struct thermal_instance *instance,
 		return next_target;
 	}
 
-	switch (trend) {
-	case THERMAL_TREND_RAISING:
-		if (throttle) {
+	if (throttle) {
+		if (trend == THERMAL_TREND_RAISING)
 			next_target = clamp((cur_state + 1), instance->lower, instance->upper);
-		}
-		break;
-	case THERMAL_TREND_DROPPING:
-		if (cur_state <= instance->lower) {
-			if (!throttle)
+	} else {
+		if (trend == THERMAL_TREND_DROPPING) {
+			if (cur_state <= instance->lower)
 				next_target = THERMAL_NO_TARGET;
-		} else {
-			if (!throttle) {
+			else
 				next_target = clamp((cur_state - 1), instance->lower, instance->upper);
-			}
 		}
-		break;
-	default:
-		break;
 	}
 
 	return next_target;

drivers/thermal/intel/Kconfig

@@ -103,15 +103,6 @@ config INTEL_TCC_COOLING
 	  on how fast the setting takes effect, and how much the CPU frequency
 	  is reduced.
 
-config INTEL_MENLOW
-	tristate "Thermal Management driver for Intel menlow platform"
-	depends on ACPI_THERMAL
-	help
-	  ACPI thermal management enhancement driver on
-	  Intel Menlow platform.
-
-	  If unsure, say N.
-
 config INTEL_HFI_THERMAL
 	bool "Intel Hardware Feedback Interface"
 	depends on NET

drivers/thermal/intel/Makefile

@@ -13,5 +13,4 @@ obj-$(CONFIG_INTEL_BXT_PMIC_THERMAL) += intel_bxt_pmic_thermal.o
 obj-$(CONFIG_INTEL_PCH_THERMAL)	+= intel_pch_thermal.o
 obj-$(CONFIG_INTEL_TCC_COOLING)	+= intel_tcc_cooling.o
 obj-$(CONFIG_X86_THERMAL_VECTOR) += therm_throt.o
-obj-$(CONFIG_INTEL_MENLOW)	+= intel_menlow.o
 obj-$(CONFIG_INTEL_HFI_THERMAL) += intel_hfi.o

drivers/thermal/intel/intel_menlow.c

-// SPDX-License-Identifier: GPL-2.0
-/*
- *  Intel menlow Driver for thermal management extension
- *
- *  Copyright (C) 2008 Intel Corp
- *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
- *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
- *
- *  This driver creates the sys I/F for programming the sensors.
- *  It also implements the driver for intel menlow memory controller (hardware
- *  id is INT0002) which makes use of the platform specific ACPI methods
- *  to get/set bandwidth.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/acpi.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/pci.h>
-#include <linux/pm.h>
-#include <linux/slab.h>
-#include <linux/thermal.h>
-#include <linux/types.h>
-#include <linux/units.h>
-
-MODULE_AUTHOR("Thomas Sujith");
-MODULE_AUTHOR("Zhang Rui");
-MODULE_DESCRIPTION("Intel Menlow platform specific driver");
-MODULE_LICENSE("GPL v2");
-
-/*
- * Memory controller device control
- */
-
-#define MEMORY_GET_BANDWIDTH "GTHS"
-#define MEMORY_SET_BANDWIDTH "STHS"
-#define MEMORY_ARG_CUR_BANDWIDTH 1
-#define MEMORY_ARG_MAX_BANDWIDTH 0
-
-static void intel_menlow_unregister_sensor(void);
-
-/*
- * GTHS returning 'n' would mean that [0,n-1] states are supported
- * In that case max_cstate would be n-1
- * GTHS returning '0' would mean that no bandwidth control states are supported
- */
-static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
-				    unsigned long *max_state)
-{
-	struct acpi_device *device = cdev->devdata;
-	acpi_handle handle = device->handle;
-	unsigned long long value;
-	struct acpi_object_list arg_list;
-	union acpi_object arg;
-	acpi_status status = AE_OK;
-
-	arg_list.count = 1;
-	arg_list.pointer = &arg;
-	arg.type = ACPI_TYPE_INTEGER;
-	arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
-	status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
-				       &arg_list, &value);
-	if (ACPI_FAILURE(status))
-		return -EFAULT;
-
-	if (!value)
-		return -EINVAL;
-
-	*max_state = value - 1;
-	return 0;
-}
-
-static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
-				    unsigned long *value)
-{
-	struct acpi_device *device = cdev->devdata;
-	acpi_handle handle = device->handle;
-	unsigned long long result;
-	struct acpi_object_list arg_list;
-	union acpi_object arg;
-	acpi_status status = AE_OK;
-
-	arg_list.count = 1;
-	arg_list.pointer = &arg;
-	arg.type = ACPI_TYPE_INTEGER;
-	arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
-	status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
-				       &arg_list, &result);
-	if (ACPI_FAILURE(status))
-		return -EFAULT;
-
-	*value = result;
-	return 0;
-}
-
-static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
-				    unsigned long state)
-{
-	struct acpi_device *device = cdev->devdata;
-	acpi_handle handle = device->handle;
-	struct acpi_object_list arg_list;
-	union acpi_object arg;
-	acpi_status status;
-	unsigned long long temp;
-	unsigned long max_state;
-
-	if (memory_get_max_bandwidth(cdev, &max_state))
-		return -EFAULT;
-
-	if (state > max_state)
-		return -EINVAL;
-
-	arg_list.count = 1;
-	arg_list.pointer = &arg;
-	arg.type = ACPI_TYPE_INTEGER;
-	arg.integer.value = state;
-
-	status =
-	    acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
-				  &temp);
-
-	pr_info("Bandwidth value was %ld: status is %d\n", state, status);
-	if (ACPI_FAILURE(status))
-		return -EFAULT;
-
-	return 0;
-}
-
-static const struct thermal_cooling_device_ops memory_cooling_ops = {
-	.get_max_state = memory_get_max_bandwidth,
-	.get_cur_state = memory_get_cur_bandwidth,
-	.set_cur_state = memory_set_cur_bandwidth,
-};
-
-/*
- * Memory Device Management
- */
-static int intel_menlow_memory_add(struct acpi_device *device)
-{
-	int result = -ENODEV;
-	struct thermal_cooling_device *cdev;
-
-	if (!device)
-		return -EINVAL;
-
-	if (!acpi_has_method(device->handle, MEMORY_GET_BANDWIDTH))
-		goto end;
-
-	if (!acpi_has_method(device->handle, MEMORY_SET_BANDWIDTH))
-		goto end;
-
-	cdev = thermal_cooling_device_register("Memory controller", device,
-					       &memory_cooling_ops);
-	if (IS_ERR(cdev)) {
-		result = PTR_ERR(cdev);
-		goto end;
-	}
-
-	device->driver_data = cdev;
-	result = sysfs_create_link(&device->dev.kobj,
-				&cdev->device.kobj, "thermal_cooling");
-	if (result)
-		goto unregister;
-
-	result = sysfs_create_link(&cdev->device.kobj,
-				&device->dev.kobj, "device");
-	if (result) {
-		sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
-		goto unregister;
-	}
-
- end:
-	return result;
-
- unregister:
-	thermal_cooling_device_unregister(cdev);
-	return result;
-
-}
-
-static void intel_menlow_memory_remove(struct acpi_device *device)
-{
-	struct thermal_cooling_device *cdev;
-
-	if (!device)
-		return;
-
-	cdev = acpi_driver_data(device);
-	if (!cdev)
-		return;
-
-	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
-	sysfs_remove_link(&cdev->device.kobj, "device");
-	thermal_cooling_device_unregister(cdev);
-}
-
-static const struct acpi_device_id intel_menlow_memory_ids[] = {
-	{"INT0002", 0},
-	{"", 0},
-};
-
-static struct acpi_driver intel_menlow_memory_driver = {
-	.name = "intel_menlow_thermal_control",
-	.ids = intel_menlow_memory_ids,
-	.ops = {
-		.add = intel_menlow_memory_add,
-		.remove = intel_menlow_memory_remove,
-		},
-};
-
-/*
- * Sensor control on menlow platform
- */
-
-#define THERMAL_AUX0 0
-#define THERMAL_AUX1 1
-#define GET_AUX0 "GAX0"
-#define GET_AUX1 "GAX1"
-#define SET_AUX0 "SAX0"
-#define SET_AUX1 "SAX1"
-
-struct intel_menlow_attribute {
-	struct device_attribute attr;
-	struct device *device;
-	acpi_handle handle;
-	struct list_head node;
-};
-
-static LIST_HEAD(intel_menlow_attr_list);
-static DEFINE_MUTEX(intel_menlow_attr_lock);
-
-/*
- * sensor_get_auxtrip - get the current auxtrip value from sensor
- * @handle: Object handle
- * @index : GET_AUX1/GET_AUX0
- * @value : The address will be fill by the value
- */
-static int sensor_get_auxtrip(acpi_handle handle, int index,
-							unsigned long long *value)
-{
-	acpi_status status;
-
-	if ((index != 0 && index != 1) || !value)
-		return -EINVAL;
-
-	status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
-				       NULL, value);
-	if (ACPI_FAILURE(status))
-		return -EIO;
-
-	return 0;
-}
-
-/*
- * sensor_set_auxtrip - set the new auxtrip value to sensor
- * @handle: Object handle
- * @index : GET_AUX1/GET_AUX0
- * @value : The value will be set
- */
-static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
-{
-	acpi_status status;
-	union acpi_object arg = {
-		ACPI_TYPE_INTEGER
-	};
-	struct acpi_object_list args = {
-		1, &arg
-	};
-	unsigned long long temp;
-
-	if (index != 0 && index != 1)
-		return -EINVAL;
-
-	status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
-				       NULL, &temp);
-	if (ACPI_FAILURE(status))
-		return -EIO;
-	if ((index && value < temp) || (!index && value > temp))
-		return -EINVAL;
-
-	arg.integer.value = value;
-	status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
-				       &args, &temp);
-	if (ACPI_FAILURE(status))
-		return -EIO;
-
-	/* do we need to check the return value of SAX0/SAX1 ? */
-
-	return 0;
-}
-
-#define to_intel_menlow_attr(_attr)	\
-	container_of(_attr, struct intel_menlow_attribute, attr)
-
-static ssize_t aux_show(struct device *dev, struct device_attribute *dev_attr,
-			char *buf, int idx)
-{
-	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
-	unsigned long long value;
-	int result;
-
-	result = sensor_get_auxtrip(attr->handle, idx, &value);
-	if (result)
-		return result;
-
-	return sprintf(buf, "%lu", deci_kelvin_to_celsius(value));
-}
-
-static ssize_t aux0_show(struct device *dev,
-			 struct device_attribute *dev_attr, char *buf)
-{
-	return aux_show(dev, dev_attr, buf, 0);
-}
-
-static ssize_t aux1_show(struct device *dev,
-			 struct device_attribute *dev_attr, char *buf)
-{
-	return aux_show(dev, dev_attr, buf, 1);
-}
-
-static ssize_t aux_store(struct device *dev, struct device_attribute *dev_attr,
-			 const char *buf, size_t count, int idx)
-{
-	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
-	int value;
-	int result;
-
-	/*Sanity check; should be a positive integer */
-	if (!sscanf(buf, "%d", &value))
-		return -EINVAL;
-
-	if (value < 0)
-		return -EINVAL;
-
-	result = sensor_set_auxtrip(attr->handle, idx,
-				    celsius_to_deci_kelvin(value));
-	return result ? result : count;
-}
-
-static ssize_t aux0_store(struct device *dev,
-			  struct device_attribute *dev_attr,
-			  const char *buf, size_t count)
-{
-	return aux_store(dev, dev_attr, buf, count, 0);
-}
-
-static ssize_t aux1_store(struct device *dev,
-			  struct device_attribute *dev_attr,
-			  const char *buf, size_t count)
-{
-	return aux_store(dev, dev_attr, buf, count, 1);
-}
-
-/* BIOS can enable/disable the thermal user application in dabney platform */
-#define BIOS_ENABLED "\\_TZ.GSTS"
-static ssize_t bios_enabled_show(struct device *dev,
-				 struct device_attribute *attr, char *buf)
-{
-	acpi_status status;
-	unsigned long long bios_enabled;
-
-	status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
-	if (ACPI_FAILURE(status))
-		return -ENODEV;
-
-	return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
-}
-
-static int intel_menlow_add_one_attribute(char *name, umode_t mode, void *show,
-					  void *store, struct device *dev,
-					  acpi_handle handle)
-{
-	struct intel_menlow_attribute *attr;
-	int result;
-
-	attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
-	if (!attr)
-		return -ENOMEM;
-
-	sysfs_attr_init(&attr->attr.attr); /* That is consistent naming :D */
-	attr->attr.attr.name = name;
-	attr->attr.attr.mode = mode;
-	attr->attr.show = show;
-	attr->attr.store = store;
-	attr->device = dev;
-	attr->handle = handle;
-
-	result = device_create_file(dev, &attr->attr);
-	if (result) {
-		kfree(attr);
-		return result;
-	}
-
-	mutex_lock(&intel_menlow_attr_lock);
-	list_add_tail(&attr->node, &intel_menlow_attr_list);
-	mutex_unlock(&intel_menlow_attr_lock);
-
-	return 0;
-}
-
-static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
-						void *context, void **rv)
-{
-	acpi_status status;
-	acpi_handle dummy;
-	struct thermal_zone_device *thermal;
-	int result;
-
-	result = acpi_bus_get_private_data(handle, (void **)&thermal);
-	if (result)
-		return 0;
-
-	/* _TZ must have the AUX0/1 methods */
-	status = acpi_get_handle(handle, GET_AUX0, &dummy);
-	if (ACPI_FAILURE(status))
-		return (status == AE_NOT_FOUND) ? AE_OK : status;
-
-	status = acpi_get_handle(handle, SET_AUX0, &dummy);
-	if (ACPI_FAILURE(status))
-		return (status == AE_NOT_FOUND) ? AE_OK : status;
-
-	result = intel_menlow_add_one_attribute("aux0", 0644,
-						aux0_show, aux0_store,
-						&thermal->device, handle);
-	if (result)
-		return AE_ERROR;
-
-	status = acpi_get_handle(handle, GET_AUX1, &dummy);
-	if (ACPI_FAILURE(status))
-		goto aux1_not_found;
-
-	status = acpi_get_handle(handle, SET_AUX1, &dummy);
-	if (ACPI_FAILURE(status))
-		goto aux1_not_found;
-
-	result = intel_menlow_add_one_attribute("aux1", 0644,
-						aux1_show, aux1_store,
-						&thermal->device, handle);
-	if (result) {
-		intel_menlow_unregister_sensor();
-		return AE_ERROR;
-	}
-
-	/*
-	 * create the "dabney_enabled" attribute which means the user app
-	 * should be loaded or not
-	 */
-
-	result = intel_menlow_add_one_attribute("bios_enabled", 0444,
-						bios_enabled_show, NULL,
-						&thermal->device, handle);
-	if (result) {
-		intel_menlow_unregister_sensor();
-		return AE_ERROR;
-	}
-
-	return AE_OK;
-
- aux1_not_found:
-	if (status == AE_NOT_FOUND)
-		return AE_OK;
-
-	intel_menlow_unregister_sensor();
-	return status;
-}
-
-static void intel_menlow_unregister_sensor(void)
-{
-	struct intel_menlow_attribute *pos, *next;
-
-	mutex_lock(&intel_menlow_attr_lock);
-	list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
-		list_del(&pos->node);
-		device_remove_file(pos->device, &pos->attr);
-		kfree(pos);
-	}
-	mutex_unlock(&intel_menlow_attr_lock);
-
-	return;
-}
-
-static int __init intel_menlow_module_init(void)
-{
-	int result = -ENODEV;
-	acpi_status status;
-	unsigned long long enable;
-
-	if (acpi_disabled)
-		return result;
-
-	/* Looking for the \_TZ.GSTS method */
-	status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
-	if (ACPI_FAILURE(status) || !enable)
-		return -ENODEV;
-
-	/* Looking for ACPI device MEM0 with hardware id INT0002 */
-	result = acpi_bus_register_driver(&intel_menlow_memory_driver);
-	if (result)
-		return result;
-
-	/* Looking for sensors in each ACPI thermal zone */
-	status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
-				     ACPI_UINT32_MAX,
-				     intel_menlow_register_sensor, NULL, NULL, NULL);
-	if (ACPI_FAILURE(status)) {
-		acpi_bus_unregister_driver(&intel_menlow_memory_driver);
-		return -ENODEV;
-	}
-
-	return 0;
-}
-
-static void __exit intel_menlow_module_exit(void)
-{
-	acpi_bus_unregister_driver(&intel_menlow_memory_driver);
-	intel_menlow_unregister_sensor();
-}
-
-module_init(intel_menlow_module_init);
-module_exit(intel_menlow_module_exit);

drivers/thermal/intel/intel_pch_thermal.c

@@ -127,7 +127,8 @@ static int pch_thermal_get_temp(struct thermal_zone_device *tzd, int *temp)
 
 static void pch_critical(struct thermal_zone_device *tzd)
 {
-	dev_dbg(&tzd->device, "%s: critical temperature reached\n", tzd->type);
+	dev_dbg(thermal_zone_device(tzd), "%s: critical temperature reached\n",
+		thermal_zone_device_type(tzd));
 }
 
 static struct thermal_zone_device_ops tzd_ops = {

drivers/thermal/thermal_core.c

@@ -1398,6 +1398,12 @@ int thermal_zone_device_id(struct thermal_zone_device *tzd)
 }
 EXPORT_SYMBOL_GPL(thermal_zone_device_id);
 
+struct device *thermal_zone_device(struct thermal_zone_device *tzd)
+{
+	return &tzd->device;
+}
+EXPORT_SYMBOL_GPL(thermal_zone_device);
+
 /**
  * thermal_zone_device_unregister - removes the registered thermal zone device
  * @tz: the thermal zone device to remove

include/linux/thermal.h

@@ -313,6 +313,7 @@ thermal_zone_device_register_with_trips(const char *, struct thermal_trip *, int
 void *thermal_zone_device_priv(struct thermal_zone_device *tzd);
 const char *thermal_zone_device_type(struct thermal_zone_device *tzd);
 int thermal_zone_device_id(struct thermal_zone_device *tzd);
+struct device *thermal_zone_device(struct thermal_zone_device *tzd);
 
 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
 				     struct thermal_cooling_device *,