thermal: exynos: Bifurcate exynos thermal common and tmu controller code (1b678641) · Commits · 戴 / test

drivers/thermal/samsung/Kconfig

+14 −5

Original line number	Original line	Diff line number	Diff line
	config EXYNOS_THERMAL		config EXYNOS_THERMAL
	tristate "Temperature sensor on Samsung EXYNOS"		tristate "Exynos thermal management unit driver"
	depends on ARCH_HAS_BANDGAP		depends on ARCH_HAS_BANDGAP
	help		help
	If you say yes here you get support for TMU (Thermal Management		If you say yes here you get support for the TMU (Thermal Management
	Unit) on SAMSUNG EXYNOS series of SoC. This helps in registering		Unit) driver for SAMSUNG EXYNOS series of soc. This driver initialises
	the exynos thermal driver with the core thermal layer and cpu		the TMU, reports temperature and handles cooling action if defined.
	cooling API's.		This driver uses the exynos core thermal API's.

			config EXYNOS_THERMAL_CORE
			bool "Core thermal framework support for EXYNOS SOC's"
			depends on EXYNOS_THERMAL
			help
			If you say yes here you get support for EXYNOS TMU
			(Thermal Management Unit) common registration/unregistration
			functions to the core thermal layer and also to use the generic
			cpu cooling API's.

drivers/thermal/samsung/Makefile

+3 −1

Original line number	Original line	Diff line number	Diff line
	#		#
	# Samsung thermal specific Makefile		# Samsung thermal specific Makefile
	#		#
	obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o		obj-$(CONFIG_EXYNOS_THERMAL) += exynos_soc_thermal.o
			exynos_soc_thermal-y := exynos_thermal.o
			exynos_soc_thermal-$(CONFIG_EXYNOS_THERMAL_CORE) += exynos_thermal_common.o

drivers/thermal/samsung/exynos_thermal.c

+6 −413

Original line number	Original line	Diff line number	Diff line
	@@ -21,23 +21,15 @@
	*		*
	*/		*/

	#include <linux/module.h>
	#include <linux/err.h>
	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/platform_device.h>
	#include <linux/interrupt.h>
	#include <linux/clk.h>		#include <linux/clk.h>
	#include <linux/workqueue.h>
	#include <linux/sysfs.h>
	#include <linux/kobject.h>
	#include <linux/io.h>		#include <linux/io.h>
	#include <linux/mutex.h>		#include <linux/interrupt.h>
	#include <linux/platform_data/exynos_thermal.h>		#include <linux/module.h>
	#include <linux/thermal.h>
	#include <linux/cpufreq.h>
	#include <linux/cpu_cooling.h>
	#include <linux/of.h>		#include <linux/of.h>
			#include <linux/platform_device.h>
			#include <linux/platform_data/exynos_thermal.h>

			#include "exynos_thermal_common.h"

	/* Exynos generic registers */		/* Exynos generic registers */
	#define EXYNOS_TMU_REG_TRIMINFO 0x0		#define EXYNOS_TMU_REG_TRIMINFO 0x0
	@@ -88,16 +80,6 @@
	#define EFUSE_MIN_VALUE 40		#define EFUSE_MIN_VALUE 40
	#define EFUSE_MAX_VALUE 100		#define EFUSE_MAX_VALUE 100

	/* In-kernel thermal framework related macros & definations */
	#define SENSOR_NAME_LEN 16
	#define MAX_TRIP_COUNT 8
	#define MAX_COOLING_DEVICE 4
	#define MAX_THRESHOLD_LEVS 4

	#define ACTIVE_INTERVAL 500
	#define IDLE_INTERVAL 10000
	#define MCELSIUS 1000

	#ifdef CONFIG_THERMAL_EMULATION		#ifdef CONFIG_THERMAL_EMULATION
	#define EXYNOS_EMUL_TIME 0x57F0		#define EXYNOS_EMUL_TIME 0x57F0
	#define EXYNOS_EMUL_TIME_SHIFT 16		#define EXYNOS_EMUL_TIME_SHIFT 16
	@@ -106,17 +88,6 @@
	#define EXYNOS_EMUL_ENABLE 0x1		#define EXYNOS_EMUL_ENABLE 0x1
	#endif /* CONFIG_THERMAL_EMULATION */		#endif /* CONFIG_THERMAL_EMULATION */

	/* CPU Zone information */
	#define PANIC_ZONE 4
	#define WARN_ZONE 3
	#define MONITOR_ZONE 2
	#define SAFE_ZONE 1

	#define GET_ZONE(trip) (trip + 2)
	#define GET_TRIP(zone) (zone - 2)

	#define EXYNOS_ZONE_COUNT 3

	struct exynos_tmu_data {		struct exynos_tmu_data {
	struct exynos_tmu_platform_data *pdata;		struct exynos_tmu_platform_data *pdata;
	struct resource *mem;		struct resource *mem;
	@@ -129,384 +100,6 @@ struct exynos_tmu_data {
	u8 temp_error1, temp_error2;		u8 temp_error1, temp_error2;
	};		};

	struct thermal_trip_point_conf {
	int trip_val[MAX_TRIP_COUNT];
	int trip_count;
	u8 trigger_falling;
	};

	struct thermal_cooling_conf {
	struct freq_clip_table freq_data[MAX_TRIP_COUNT];
	int freq_clip_count;
	};

	struct thermal_sensor_conf {
	char name[SENSOR_NAME_LEN];
	int (read_temperature)(void data);
	int (write_emul_temp)(void drv_data, unsigned long temp);
	struct thermal_trip_point_conf trip_data;
	struct thermal_cooling_conf cooling_data;
	void *private_data;
	};

	struct exynos_thermal_zone {
	enum thermal_device_mode mode;
	struct thermal_zone_device *therm_dev;
	struct thermal_cooling_device *cool_dev[MAX_COOLING_DEVICE];
	unsigned int cool_dev_size;
	struct platform_device *exynos4_dev;
	struct thermal_sensor_conf *sensor_conf;
	bool bind;
	};

	static struct exynos_thermal_zone *th_zone;
	static void exynos_unregister_thermal(void);
	static int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf);

	/* Get mode callback functions for thermal zone */
	static int exynos_get_mode(struct thermal_zone_device *thermal,
	enum thermal_device_mode *mode)
	{
	if (th_zone)
	*mode = th_zone->mode;
	return 0;
	}

	/* Set mode callback functions for thermal zone */
	static int exynos_set_mode(struct thermal_zone_device *thermal,
	enum thermal_device_mode mode)
	{
	if (!th_zone->therm_dev) {
	pr_notice("thermal zone not registered\n");
	return 0;
	}

	mutex_lock(&th_zone->therm_dev->lock);

	if (mode == THERMAL_DEVICE_ENABLED &&
	!th_zone->sensor_conf->trip_data.trigger_falling)
	th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
	else
	th_zone->therm_dev->polling_delay = 0;

	mutex_unlock(&th_zone->therm_dev->lock);

	th_zone->mode = mode;
	thermal_zone_device_update(th_zone->therm_dev);
	pr_info("thermal polling set for duration=%d msec\n",
	th_zone->therm_dev->polling_delay);
	return 0;
	}


	/* Get trip type callback functions for thermal zone */
	static int exynos_get_trip_type(struct thermal_zone_device *thermal, int trip,
	enum thermal_trip_type *type)
	{
	switch (GET_ZONE(trip)) {
	case MONITOR_ZONE:
	case WARN_ZONE:
	*type = THERMAL_TRIP_ACTIVE;
	break;
	case PANIC_ZONE:
	*type = THERMAL_TRIP_CRITICAL;
	break;
	default:
	return -EINVAL;
	}
	return 0;
	}

	/* Get trip temperature callback functions for thermal zone */
	static int exynos_get_trip_temp(struct thermal_zone_device *thermal, int trip,
	unsigned long *temp)
	{
	if (trip < GET_TRIP(MONITOR_ZONE) \|\| trip > GET_TRIP(PANIC_ZONE))
	return -EINVAL;

	*temp = th_zone->sensor_conf->trip_data.trip_val[trip];
	/* convert the temperature into millicelsius */
	temp = temp * MCELSIUS;

	return 0;
	}

	/* Get critical temperature callback functions for thermal zone */
	static int exynos_get_crit_temp(struct thermal_zone_device *thermal,
	unsigned long *temp)
	{
	int ret;
	/* Panic zone */
	ret = exynos_get_trip_temp(thermal, GET_TRIP(PANIC_ZONE), temp);
	return ret;
	}

	/* Bind callback functions for thermal zone */
	static int exynos_bind(struct thermal_zone_device *thermal,
	struct thermal_cooling_device *cdev)
	{
	int ret = 0, i, tab_size, level;
	struct freq_clip_table tab_ptr, clip_data;
	struct thermal_sensor_conf *data = th_zone->sensor_conf;

	tab_ptr = (struct freq_clip_table *)data->cooling_data.freq_data;
	tab_size = data->cooling_data.freq_clip_count;

	if (tab_ptr == NULL \|\| tab_size == 0)
	return -EINVAL;

	/* find the cooling device registered*/
	for (i = 0; i < th_zone->cool_dev_size; i++)
	if (cdev == th_zone->cool_dev[i])
	break;

	/* No matching cooling device */
	if (i == th_zone->cool_dev_size)
	return 0;

	/* Bind the thermal zone to the cpufreq cooling device */
	for (i = 0; i < tab_size; i++) {
	clip_data = (struct freq_clip_table *)&(tab_ptr[i]);
	level = cpufreq_cooling_get_level(0, clip_data->freq_clip_max);
	if (level == THERMAL_CSTATE_INVALID)
	return 0;
	switch (GET_ZONE(i)) {
	case MONITOR_ZONE:
	case WARN_ZONE:
	if (thermal_zone_bind_cooling_device(thermal, i, cdev,
	level, 0)) {
	pr_err("error binding cdev inst %d\n", i);
	ret = -EINVAL;
	}
	th_zone->bind = true;
	break;
	default:
	ret = -EINVAL;
	}
	}

	return ret;
	}

	/* Unbind callback functions for thermal zone */
	static int exynos_unbind(struct thermal_zone_device *thermal,
	struct thermal_cooling_device *cdev)
	{
	int ret = 0, i, tab_size;
	struct thermal_sensor_conf *data = th_zone->sensor_conf;

	if (th_zone->bind == false)
	return 0;

	tab_size = data->cooling_data.freq_clip_count;

	if (tab_size == 0)
	return -EINVAL;

	/* find the cooling device registered*/
	for (i = 0; i < th_zone->cool_dev_size; i++)
	if (cdev == th_zone->cool_dev[i])
	break;

	/* No matching cooling device */
	if (i == th_zone->cool_dev_size)
	return 0;

	/* Bind the thermal zone to the cpufreq cooling device */
	for (i = 0; i < tab_size; i++) {
	switch (GET_ZONE(i)) {
	case MONITOR_ZONE:
	case WARN_ZONE:
	if (thermal_zone_unbind_cooling_device(thermal, i,
	cdev)) {
	pr_err("error unbinding cdev inst=%d\n", i);
	ret = -EINVAL;
	}
	th_zone->bind = false;
	break;
	default:
	ret = -EINVAL;
	}
	}
	return ret;
	}

	/* Get temperature callback functions for thermal zone */
	static int exynos_get_temp(struct thermal_zone_device *thermal,
	unsigned long *temp)
	{
	void *data;

	if (!th_zone->sensor_conf) {
	pr_info("Temperature sensor not initialised\n");
	return -EINVAL;
	}
	data = th_zone->sensor_conf->private_data;
	*temp = th_zone->sensor_conf->read_temperature(data);
	/* convert the temperature into millicelsius */
	temp = temp * MCELSIUS;
	return 0;
	}

	/* Get temperature callback functions for thermal zone */
	static int exynos_set_emul_temp(struct thermal_zone_device *thermal,
	unsigned long temp)
	{
	void *data;
	int ret = -EINVAL;

	if (!th_zone->sensor_conf) {
	pr_info("Temperature sensor not initialised\n");
	return -EINVAL;
	}
	data = th_zone->sensor_conf->private_data;
	if (th_zone->sensor_conf->write_emul_temp)
	ret = th_zone->sensor_conf->write_emul_temp(data, temp);
	return ret;
	}

	/* Get the temperature trend */
	static int exynos_get_trend(struct thermal_zone_device *thermal,
	int trip, enum thermal_trend *trend)
	{
	int ret;
	unsigned long trip_temp;

	ret = exynos_get_trip_temp(thermal, trip, &trip_temp);
	if (ret < 0)
	return ret;

	if (thermal->temperature >= trip_temp)
	*trend = THERMAL_TREND_RAISE_FULL;
	else
	*trend = THERMAL_TREND_DROP_FULL;

	return 0;
	}
	/* Operation callback functions for thermal zone */
	static struct thermal_zone_device_ops const exynos_dev_ops = {
	.bind = exynos_bind,
	.unbind = exynos_unbind,
	.get_temp = exynos_get_temp,
	.set_emul_temp = exynos_set_emul_temp,
	.get_trend = exynos_get_trend,
	.get_mode = exynos_get_mode,
	.set_mode = exynos_set_mode,
	.get_trip_type = exynos_get_trip_type,
	.get_trip_temp = exynos_get_trip_temp,
	.get_crit_temp = exynos_get_crit_temp,
	};

	/*
	* This function may be called from interrupt based temperature sensor
	* when threshold is changed.
	*/
	static void exynos_report_trigger(void)
	{
	unsigned int i;
	char data[10];
	char *envp[] = { data, NULL };

	if (!th_zone \|\| !th_zone->therm_dev)
	return;
	if (th_zone->bind == false) {
	for (i = 0; i < th_zone->cool_dev_size; i++) {
	if (!th_zone->cool_dev[i])
	continue;
	exynos_bind(th_zone->therm_dev,
	th_zone->cool_dev[i]);
	}
	}

	thermal_zone_device_update(th_zone->therm_dev);

	mutex_lock(&th_zone->therm_dev->lock);
	/* Find the level for which trip happened */
	for (i = 0; i < th_zone->sensor_conf->trip_data.trip_count; i++) {
	if (th_zone->therm_dev->last_temperature <
	th_zone->sensor_conf->trip_data.trip_val[i] * MCELSIUS)
	break;
	}

	if (th_zone->mode == THERMAL_DEVICE_ENABLED &&
	!th_zone->sensor_conf->trip_data.trigger_falling) {
	if (i > 0)
	th_zone->therm_dev->polling_delay = ACTIVE_INTERVAL;
	else
	th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
	}

	snprintf(data, sizeof(data), "%u", i);
	kobject_uevent_env(&th_zone->therm_dev->device.kobj, KOBJ_CHANGE, envp);
	mutex_unlock(&th_zone->therm_dev->lock);
	}

	/* Register with the in-kernel thermal management */
	static int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf)
	{
	int ret;
	struct cpumask mask_val;

	if (!sensor_conf \|\| !sensor_conf->read_temperature) {
	pr_err("Temperature sensor not initialised\n");
	return -EINVAL;
	}

	th_zone = kzalloc(sizeof(struct exynos_thermal_zone), GFP_KERNEL);
	if (!th_zone)
	return -ENOMEM;

	th_zone->sensor_conf = sensor_conf;
	cpumask_set_cpu(0, &mask_val);
	th_zone->cool_dev[0] = cpufreq_cooling_register(&mask_val);
	if (IS_ERR(th_zone->cool_dev[0])) {
	pr_err("Failed to register cpufreq cooling device\n");
	ret = -EINVAL;
	goto err_unregister;
	}
	th_zone->cool_dev_size++;

	th_zone->therm_dev = thermal_zone_device_register(sensor_conf->name,
	EXYNOS_ZONE_COUNT, 0, NULL, &exynos_dev_ops, NULL, 0,
	sensor_conf->trip_data.trigger_falling ?
	0 : IDLE_INTERVAL);

	if (IS_ERR(th_zone->therm_dev)) {
	pr_err("Failed to register thermal zone device\n");
	ret = PTR_ERR(th_zone->therm_dev);
	goto err_unregister;
	}
	th_zone->mode = THERMAL_DEVICE_ENABLED;

	pr_info("Exynos: Kernel Thermal management registered\n");

	return 0;

	err_unregister:
	exynos_unregister_thermal();
	return ret;
	}

	/* Un-Register with the in-kernel thermal management */
	static void exynos_unregister_thermal(void)
	{
	int i;

	if (!th_zone)
	return;

	if (th_zone->therm_dev)
	thermal_zone_device_unregister(th_zone->therm_dev);

	for (i = 0; i < th_zone->cool_dev_size; i++) {
	if (th_zone->cool_dev[i])
	cpufreq_cooling_unregister(th_zone->cool_dev[i]);
	}

	kfree(th_zone);
	pr_info("Exynos: Kernel Thermal management unregistered\n");
	}

	/*		/*
	* TMU treats temperature as a mapped temperature code.		* TMU treats temperature as a mapped temperature code.
	* The temperature is converted differently depending on the calibration type.		* The temperature is converted differently depending on the calibration type.

drivers/thermal/samsung/exynos_thermal_common.c

0 → 100644

+385 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* exynos_thermal_common.c - Samsung EXYNOS common thermal file
			*
			* Copyright (C) 2013 Samsung Electronics
			* Amit Daniel Kachhap <amit.daniel@samsung.com>
			*
			* This program is free software; you can redistribute it and/or modify
			* it under the terms of the GNU General Public License as published by
			* the Free Software Foundation; either version 2 of the License, or
			* (at your option) any later version.
			*
			* This program is distributed in the hope that it will be useful,
			* but WITHOUT ANY WARRANTY; without even the implied warranty of
			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
			* GNU General Public License for more details.
			*
			* You should have received a copy of the GNU General Public License
			* along with this program; if not, write to the Free Software
			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
			*
			*/

			#include <linux/cpu_cooling.h>
			#include <linux/err.h>
			#include <linux/platform_data/exynos_thermal.h>
			#include <linux/slab.h>
			#include <linux/thermal.h>

			#include "exynos_thermal_common.h"

			struct exynos_thermal_zone {
			enum thermal_device_mode mode;
			struct thermal_zone_device *therm_dev;
			struct thermal_cooling_device *cool_dev[MAX_COOLING_DEVICE];
			unsigned int cool_dev_size;
			struct platform_device *exynos4_dev;
			struct thermal_sensor_conf *sensor_conf;
			bool bind;
			};

			static struct exynos_thermal_zone *th_zone;

			/* Get mode callback functions for thermal zone */
			static int exynos_get_mode(struct thermal_zone_device *thermal,
			enum thermal_device_mode *mode)
			{
			if (th_zone)
			*mode = th_zone->mode;
			return 0;
			}

			/* Set mode callback functions for thermal zone */
			static int exynos_set_mode(struct thermal_zone_device *thermal,
			enum thermal_device_mode mode)
			{
			if (!th_zone->therm_dev) {
			pr_notice("thermal zone not registered\n");
			return 0;
			}

			mutex_lock(&th_zone->therm_dev->lock);

			if (mode == THERMAL_DEVICE_ENABLED &&
			!th_zone->sensor_conf->trip_data.trigger_falling)
			th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
			else
			th_zone->therm_dev->polling_delay = 0;

			mutex_unlock(&th_zone->therm_dev->lock);

			th_zone->mode = mode;
			thermal_zone_device_update(th_zone->therm_dev);
			pr_info("thermal polling set for duration=%d msec\n",
			th_zone->therm_dev->polling_delay);
			return 0;
			}


			/* Get trip type callback functions for thermal zone */
			static int exynos_get_trip_type(struct thermal_zone_device *thermal, int trip,
			enum thermal_trip_type *type)
			{
			switch (GET_ZONE(trip)) {
			case MONITOR_ZONE:
			case WARN_ZONE:
			*type = THERMAL_TRIP_ACTIVE;
			break;
			case PANIC_ZONE:
			*type = THERMAL_TRIP_CRITICAL;
			break;
			default:
			return -EINVAL;
			}
			return 0;
			}

			/* Get trip temperature callback functions for thermal zone */
			static int exynos_get_trip_temp(struct thermal_zone_device *thermal, int trip,
			unsigned long *temp)
			{
			if (trip < GET_TRIP(MONITOR_ZONE) \|\| trip > GET_TRIP(PANIC_ZONE))
			return -EINVAL;

			*temp = th_zone->sensor_conf->trip_data.trip_val[trip];
			/* convert the temperature into millicelsius */
			temp = temp * MCELSIUS;

			return 0;
			}

			/* Get critical temperature callback functions for thermal zone */
			static int exynos_get_crit_temp(struct thermal_zone_device *thermal,
			unsigned long *temp)
			{
			int ret;
			/* Panic zone */
			ret = exynos_get_trip_temp(thermal, GET_TRIP(PANIC_ZONE), temp);
			return ret;
			}

			/* Bind callback functions for thermal zone */
			static int exynos_bind(struct thermal_zone_device *thermal,
			struct thermal_cooling_device *cdev)
			{
			int ret = 0, i, tab_size, level;
			struct freq_clip_table tab_ptr, clip_data;
			struct thermal_sensor_conf *data = th_zone->sensor_conf;

			tab_ptr = (struct freq_clip_table *)data->cooling_data.freq_data;
			tab_size = data->cooling_data.freq_clip_count;

			if (tab_ptr == NULL \|\| tab_size == 0)
			return -EINVAL;

			/* find the cooling device registered*/
			for (i = 0; i < th_zone->cool_dev_size; i++)
			if (cdev == th_zone->cool_dev[i])
			break;

			/* No matching cooling device */
			if (i == th_zone->cool_dev_size)
			return 0;

			/* Bind the thermal zone to the cpufreq cooling device */
			for (i = 0; i < tab_size; i++) {
			clip_data = (struct freq_clip_table *)&(tab_ptr[i]);
			level = cpufreq_cooling_get_level(0, clip_data->freq_clip_max);
			if (level == THERMAL_CSTATE_INVALID)
			return 0;
			switch (GET_ZONE(i)) {
			case MONITOR_ZONE:
			case WARN_ZONE:
			if (thermal_zone_bind_cooling_device(thermal, i, cdev,
			level, 0)) {
			pr_err("error binding cdev inst %d\n", i);
			ret = -EINVAL;
			}
			th_zone->bind = true;
			break;
			default:
			ret = -EINVAL;
			}
			}

			return ret;
			}

			/* Unbind callback functions for thermal zone */
			static int exynos_unbind(struct thermal_zone_device *thermal,
			struct thermal_cooling_device *cdev)
			{
			int ret = 0, i, tab_size;
			struct thermal_sensor_conf *data = th_zone->sensor_conf;

			if (th_zone->bind == false)
			return 0;

			tab_size = data->cooling_data.freq_clip_count;

			if (tab_size == 0)
			return -EINVAL;

			/* find the cooling device registered*/
			for (i = 0; i < th_zone->cool_dev_size; i++)
			if (cdev == th_zone->cool_dev[i])
			break;

			/* No matching cooling device */
			if (i == th_zone->cool_dev_size)
			return 0;

			/* Bind the thermal zone to the cpufreq cooling device */
			for (i = 0; i < tab_size; i++) {
			switch (GET_ZONE(i)) {
			case MONITOR_ZONE:
			case WARN_ZONE:
			if (thermal_zone_unbind_cooling_device(thermal, i,
			cdev)) {
			pr_err("error unbinding cdev inst=%d\n", i);
			ret = -EINVAL;
			}
			th_zone->bind = false;
			break;
			default:
			ret = -EINVAL;
			}
			}
			return ret;
			}

			/* Get temperature callback functions for thermal zone */
			static int exynos_get_temp(struct thermal_zone_device *thermal,
			unsigned long *temp)
			{
			void *data;

			if (!th_zone->sensor_conf) {
			pr_info("Temperature sensor not initialised\n");
			return -EINVAL;
			}
			data = th_zone->sensor_conf->private_data;
			*temp = th_zone->sensor_conf->read_temperature(data);
			/* convert the temperature into millicelsius */
			temp = temp * MCELSIUS;
			return 0;
			}

			/* Get temperature callback functions for thermal zone */
			static int exynos_set_emul_temp(struct thermal_zone_device *thermal,
			unsigned long temp)
			{
			void *data;
			int ret = -EINVAL;

			if (!th_zone->sensor_conf) {
			pr_info("Temperature sensor not initialised\n");
			return -EINVAL;
			}
			data = th_zone->sensor_conf->private_data;
			if (th_zone->sensor_conf->write_emul_temp)
			ret = th_zone->sensor_conf->write_emul_temp(data, temp);
			return ret;
			}

			/* Get the temperature trend */
			static int exynos_get_trend(struct thermal_zone_device *thermal,
			int trip, enum thermal_trend *trend)
			{
			int ret;
			unsigned long trip_temp;

			ret = exynos_get_trip_temp(thermal, trip, &trip_temp);
			if (ret < 0)
			return ret;

			if (thermal->temperature >= trip_temp)
			*trend = THERMAL_TREND_RAISE_FULL;
			else
			*trend = THERMAL_TREND_DROP_FULL;

			return 0;
			}
			/* Operation callback functions for thermal zone */
			static struct thermal_zone_device_ops const exynos_dev_ops = {
			.bind = exynos_bind,
			.unbind = exynos_unbind,
			.get_temp = exynos_get_temp,
			.set_emul_temp = exynos_set_emul_temp,
			.get_trend = exynos_get_trend,
			.get_mode = exynos_get_mode,
			.set_mode = exynos_set_mode,
			.get_trip_type = exynos_get_trip_type,
			.get_trip_temp = exynos_get_trip_temp,
			.get_crit_temp = exynos_get_crit_temp,
			};

			/*
			* This function may be called from interrupt based temperature sensor
			* when threshold is changed.
			*/
			void exynos_report_trigger(void)
			{
			unsigned int i;
			char data[10];
			char *envp[] = { data, NULL };

			if (!th_zone \|\| !th_zone->therm_dev)
			return;
			if (th_zone->bind == false) {
			for (i = 0; i < th_zone->cool_dev_size; i++) {
			if (!th_zone->cool_dev[i])
			continue;
			exynos_bind(th_zone->therm_dev,
			th_zone->cool_dev[i]);
			}
			}

			thermal_zone_device_update(th_zone->therm_dev);

			mutex_lock(&th_zone->therm_dev->lock);
			/* Find the level for which trip happened */
			for (i = 0; i < th_zone->sensor_conf->trip_data.trip_count; i++) {
			if (th_zone->therm_dev->last_temperature <
			th_zone->sensor_conf->trip_data.trip_val[i] * MCELSIUS)
			break;
			}

			if (th_zone->mode == THERMAL_DEVICE_ENABLED &&
			!th_zone->sensor_conf->trip_data.trigger_falling) {
			if (i > 0)
			th_zone->therm_dev->polling_delay = ACTIVE_INTERVAL;
			else
			th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
			}

			snprintf(data, sizeof(data), "%u", i);
			kobject_uevent_env(&th_zone->therm_dev->device.kobj, KOBJ_CHANGE, envp);
			mutex_unlock(&th_zone->therm_dev->lock);
			}

			/* Register with the in-kernel thermal management */
			int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf)
			{
			int ret;
			struct cpumask mask_val;

			if (!sensor_conf \|\| !sensor_conf->read_temperature) {
			pr_err("Temperature sensor not initialised\n");
			return -EINVAL;
			}

			th_zone = kzalloc(sizeof(struct exynos_thermal_zone), GFP_KERNEL);
			if (!th_zone)
			return -ENOMEM;

			th_zone->sensor_conf = sensor_conf;
			cpumask_set_cpu(0, &mask_val);
			th_zone->cool_dev[0] = cpufreq_cooling_register(&mask_val);
			if (IS_ERR(th_zone->cool_dev[0])) {
			pr_err("Failed to register cpufreq cooling device\n");
			ret = -EINVAL;
			goto err_unregister;
			}
			th_zone->cool_dev_size++;

			th_zone->therm_dev = thermal_zone_device_register(sensor_conf->name,
			EXYNOS_ZONE_COUNT, 0, NULL, &exynos_dev_ops, NULL, 0,
			sensor_conf->trip_data.trigger_falling ?
			0 : IDLE_INTERVAL);

			if (IS_ERR(th_zone->therm_dev)) {
			pr_err("Failed to register thermal zone device\n");
			ret = PTR_ERR(th_zone->therm_dev);
			goto err_unregister;
			}
			th_zone->mode = THERMAL_DEVICE_ENABLED;

			pr_info("Exynos: Kernel Thermal management registered\n");

			return 0;

			err_unregister:
			exynos_unregister_thermal();
			return ret;
			}

			/* Un-Register with the in-kernel thermal management */
			void exynos_unregister_thermal(void)
			{
			int i;

			if (!th_zone)
			return;

			if (th_zone->therm_dev)
			thermal_zone_device_unregister(th_zone->therm_dev);

			for (i = 0; i < th_zone->cool_dev_size; i++) {
			if (th_zone->cool_dev[i])
			cpufreq_cooling_unregister(th_zone->cool_dev[i]);
			}

			kfree(th_zone);
			pr_info("Exynos: Kernel Thermal management unregistered\n");
			}

drivers/thermal/samsung/exynos_thermal_common.h

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