drivers/staging/omap-thermal/omap-thermal-common.c - linux - Git at Google

 /*
  * OMAP thermal driver interface
  *
  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
  * Contact:
  *   Eduardo Valentin <eduardo.valentin@ti.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * version 2 as published by the Free Software Foundation.
  *
  * 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., 51 Franklin St, Fifth Floor, Boston, MA
  * 02110-1301 USA
  *
  */

 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/mutex.h>
 #include <linux/gfp.h>
 #include <linux/kernel.h>
 #include <linux/workqueue.h>
 #include <linux/thermal.h>
 #include <linux/cpufreq.h>
 #include <linux/cpu_cooling.h>

 #include "omap-thermal.h"
 #include "omap-bandgap.h"

 /* common data structures */
 struct omap_thermal_data {
 	struct thermal_zone_device *omap_thermal;
 	struct thermal_cooling_device *cool_dev;
 	struct omap_bandgap *bg_ptr;
 	enum thermal_device_mode mode;
 	struct work_struct thermal_wq;
 	int sensor_id;
 };

 static void omap_thermal_work(struct work_struct *work)
 {
 	struct omap_thermal_data *data = container_of(work,
 					struct omap_thermal_data, thermal_wq);

 	thermal_zone_device_update(data->omap_thermal);

 	dev_dbg(&data->omap_thermal->device, "updated thermal zone %s\n",
 		data->omap_thermal->type);
 }

 /**
  * omap_thermal_hotspot_temperature - returns sensor extrapolated temperature
  * @t:	omap sensor temperature
  * @s:	omap sensor slope value
  * @c:	omap sensor const value
  */
 static inline int omap_thermal_hotspot_temperature(int t, int s, int c)
 {
 	int delta = t * s / 1000 + c;

 	if (delta < 0)
 		delta = 0;

 	return t + delta;
 }

 /* thermal zone ops */
 /* Get temperature callback function for thermal zone*/
 static inline int omap_thermal_get_temp(struct thermal_zone_device *thermal,
 					 unsigned long *temp)
 {
 	struct omap_thermal_data *data = thermal->devdata;
 	struct omap_bandgap *bg_ptr;
 	struct omap_temp_sensor *s;
 	int ret, tmp, pcb_temp, slope, constant;

 	if (!data)
 		return 0;

 	bg_ptr = data->bg_ptr;
 	s = &bg_ptr->conf->sensors[data->sensor_id];

 	ret = omap_bandgap_read_temperature(bg_ptr, data->sensor_id, &tmp);
 	if (ret)
 		return ret;

 	pcb_temp = 0;
 	/* TODO: Introduce pcb temperature lookup */
 	/* In case pcb zone is available, use the extrapolation rule with it */
 	if (pcb_temp) {
 		tmp -= pcb_temp;
 		slope = s->slope_pcb;
 		constant = s->constant_pcb;
 	} else {
 		slope = s->slope;
 		constant = s->constant;
 	}
 	*temp = omap_thermal_hotspot_temperature(tmp, slope, constant);

 	return ret;
 }

 /* Bind callback functions for thermal zone */
 static int omap_thermal_bind(struct thermal_zone_device *thermal,
 			      struct thermal_cooling_device *cdev)
 {
 	struct omap_thermal_data *data = thermal->devdata;
 	int max, id;

 	if (IS_ERR_OR_NULL(data))
 		return -ENODEV;

 	/* check if this is the cooling device we registered */
 	if (data->cool_dev != cdev)
 		return 0;

 	id = data->sensor_id;
 	max = data->bg_ptr->conf->sensors[id].cooling_data.freq_clip_count;

 	/* TODO: bind with min and max states */
 	/* Simple thing, two trips, one passive another critical */
 	return thermal_zone_bind_cooling_device(thermal, 0, cdev,
 						THERMAL_NO_LIMIT,
 						THERMAL_NO_LIMIT);
 }

 /* Unbind callback functions for thermal zone */
 static int omap_thermal_unbind(struct thermal_zone_device *thermal,
 				struct thermal_cooling_device *cdev)
 {
 	struct omap_thermal_data *data = thermal->devdata;

 	if (IS_ERR_OR_NULL(data))
 		return -ENODEV;

 	/* check if this is the cooling device we registered */
 	if (data->cool_dev != cdev)
 		return 0;

 	/* Simple thing, two trips, one passive another critical */
 	return thermal_zone_unbind_cooling_device(thermal, 0, cdev);
 }

 /* Get mode callback functions for thermal zone */
 static int omap_thermal_get_mode(struct thermal_zone_device *thermal,
 				  enum thermal_device_mode *mode)
 {
 	struct omap_thermal_data *data = thermal->devdata;

 	if (data)
 		*mode = data->mode;

 	return 0;
 }

 /* Set mode callback functions for thermal zone */
 static int omap_thermal_set_mode(struct thermal_zone_device *thermal,
 				  enum thermal_device_mode mode)
 {
 	struct omap_thermal_data *data = thermal->devdata;

 	if (!data->omap_thermal) {
 		dev_notice(&thermal->device, "thermal zone not registered\n");
 		return 0;
 	}

 	mutex_lock(&data->omap_thermal->lock);

 	if (mode == THERMAL_DEVICE_ENABLED)
 		data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
 	else
 		data->omap_thermal->polling_delay = 0;

 	mutex_unlock(&data->omap_thermal->lock);

 	data->mode = mode;
 	thermal_zone_device_update(data->omap_thermal);
 	dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
 		data->omap_thermal->polling_delay);

 	return 0;
 }

 /* Get trip type callback functions for thermal zone */
 static int omap_thermal_get_trip_type(struct thermal_zone_device *thermal,
 				       int trip, enum thermal_trip_type *type)
 {
 	if (!omap_thermal_is_valid_trip(trip))
 		return -EINVAL;

 	if (trip + 1 == OMAP_TRIP_NUMBER)
 		*type = THERMAL_TRIP_CRITICAL;
 	else
 		*type = THERMAL_TRIP_PASSIVE;

 	return 0;
 }

 /* Get trip temperature callback functions for thermal zone */
 static int omap_thermal_get_trip_temp(struct thermal_zone_device *thermal,
 				       int trip, unsigned long *temp)
 {
 	if (!omap_thermal_is_valid_trip(trip))
 		return -EINVAL;

 	*temp = omap_thermal_get_trip_value(trip);

 	return 0;
 }

 /* Get critical temperature callback functions for thermal zone */
 static int omap_thermal_get_crit_temp(struct thermal_zone_device *thermal,
 				       unsigned long *temp)
 {
 	/* shutdown zone */
 	return omap_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
 }

 static struct thermal_zone_device_ops omap_thermal_ops = {
 	.get_temp = omap_thermal_get_temp,
 	/* TODO: add .get_trend */
 	.bind = omap_thermal_bind,
 	.unbind = omap_thermal_unbind,
 	.get_mode = omap_thermal_get_mode,
 	.set_mode = omap_thermal_set_mode,
 	.get_trip_type = omap_thermal_get_trip_type,
 	.get_trip_temp = omap_thermal_get_trip_temp,
 	.get_crit_temp = omap_thermal_get_crit_temp,
 };

 static struct omap_thermal_data
 *omap_thermal_build_data(struct omap_bandgap *bg_ptr, int id)
 {
 	struct omap_thermal_data *data;

 	data = devm_kzalloc(bg_ptr->dev, sizeof(*data), GFP_KERNEL);
 	if (!data) {
 		dev_err(bg_ptr->dev, "kzalloc fail\n");
 		return NULL;
 	}
 	data->sensor_id = id;
 	data->bg_ptr = bg_ptr;
 	data->mode = THERMAL_DEVICE_ENABLED;
 	INIT_WORK(&data->thermal_wq, omap_thermal_work);

 	return data;
 }

 int omap_thermal_expose_sensor(struct omap_bandgap *bg_ptr, int id,
 			       char *domain)
 {
 	struct omap_thermal_pdata pdata;

 	data = omap_bandgap_get_sensor_data(bg_ptr, id);

 	if (!data)
 		data = omap_thermal_build_pdata(bg_ptr, id);

 	if (!data)
 		return -EINVAL;

 	/* TODO: remove TC1 TC2 */
 	/* Create thermal zone */
 	data->omap_thermal = thermal_zone_device_register(domain,
 				OMAP_TRIP_NUMBER, 0, data, &omap_thermal_ops,
 				FAST_TEMP_MONITORING_RATE,
 				FAST_TEMP_MONITORING_RATE);
 	if (IS_ERR_OR_NULL(data->omap_thermal)) {
 		dev_err(bg_ptr->dev, "thermal zone device is NULL\n");
 		return PTR_ERR(data->omap_thermal);
 	}
 	data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
 	omap_bandgap_set_sensor_data(bg_ptr, id, data);

 	return 0;
 }

 int omap_thermal_remove_sensor(struct omap_bandgap *bg_ptr, int id)
 {
 	struct omap_thermal_data *data;

 	data = omap_bandgap_get_sensor_data(bg_ptr, id);

 	thermal_zone_device_unregister(data->omap_thermal);

 	return 0;
 }

 int omap_thermal_report_sensor_temperature(struct omap_bandgap *bg_ptr, int id)
 {
 	struct omap_thermal_data *data;

 	data = omap_bandgap_get_sensor_data(bg_ptr, id);

 	schedule_work(&data->thermal_wq);

 	return 0;
 }

 static int omap_thermal_build_cpufreq_clip(struct omap_bandgap *bg_ptr,
 					   struct freq_clip_table **tab_ptr,
 					   int *tab_size)
 {
 	struct cpufreq_frequency_table *freq_table;
 	struct freq_clip_table *tab;
 	int i, count = 0;

 	freq_table = cpufreq_frequency_get_table(0);
 	if (IS_ERR_OR_NULL(freq_table)) {
 		dev_err(bg_ptr->dev,
 			"%s: failed to get cpufreq table (%p)\n",
 			__func__, freq_table);
 		return -EINVAL;
 	}

 	for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
 		unsigned int freq = freq_table[i].frequency;
 		if (freq == CPUFREQ_ENTRY_INVALID)
 			continue;
 		count++;
 	}

 	tab = devm_kzalloc(bg_ptr->dev, sizeof(*tab) * count, GFP_KERNEL);
 	if (!tab) {
 		dev_err(bg_ptr->dev,
 			"%s: no memory available\n", __func__);
 		return -ENOMEM;
 	}

 	for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
 		unsigned int freq = freq_table[i].frequency;

 		if (freq == CPUFREQ_ENTRY_INVALID)
 			continue;

 		tab[count - i - 1].freq_clip_max = freq;
 		tab[count - i - 1].temp_level = OMAP_TRIP_HOT;
 		tab[count - i - 1].mask_val = cpumask_of(0);
 	}

 	*tab_ptr = tab;
 	*tab_size = count;

 	return 0;
 }

 int omap_thermal_register_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
 {
 	struct omap_thermal_data *data;
 	struct freq_clip_table *tab_ptr;
 	int tab_size, ret;

 	data = omap_bandgap_get_sensor_data(bg_ptr, id);
 	if (!data)
 		data = omap_thermal_build_pdata(bg_ptr, id);

 	if (!data)
 		return -EINVAL;

 	ret = omap_thermal_build_cpufreq_clip(bg_ptr, &tab_ptr, &tab_size);
 	if (ret < 0) {
 		dev_err(bg_ptr->dev,
 			"%s: failed to build cpufreq clip table\n", __func__);
 		return ret;
 	}

 	/* Register cooling device */
 	data->cool_dev = cpufreq_cooling_register(tab_ptr, tab_size);
 	if (IS_ERR_OR_NULL(data->cool_dev)) {
 		dev_err(bg_ptr->dev,
 			"Failed to register cpufreq cooling device\n");
 		return PTR_ERR(data->cool_dev);
 	}
 	bg_ptr->conf->sensors[id].cooling_data.freq_clip_count = tab_size;
 	omap_bandgap_set_sensor_data(bg_ptr, id, data);

 	return 0;
 }

 int omap_thermal_unregister_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
 {
 	struct omap_thermal_data *data;

 	data = omap_bandgap_get_sensor_data(bg_ptr, id);
 	cpufreq_cooling_unregister(data->cool_dev);

 	return 0;
 }
	/*
	* OMAP thermal driver interface
	*
	* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
	* Contact:
	* Eduardo Valentin <eduardo.valentin@ti.com>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* version 2 as published by the Free Software Foundation.
	*
	* 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., 51 Franklin St, Fifth Floor, Boston, MA
	* 02110-1301 USA
	*
	*/

	#include <linux/device.h>
	#include <linux/err.h>
	#include <linux/mutex.h>
	#include <linux/gfp.h>
	#include <linux/kernel.h>
	#include <linux/workqueue.h>
	#include <linux/thermal.h>
	#include <linux/cpufreq.h>
	#include <linux/cpu_cooling.h>

	#include "omap-thermal.h"
	#include "omap-bandgap.h"

	/* common data structures */
	struct omap_thermal_data {
	struct thermal_zone_device *omap_thermal;
	struct thermal_cooling_device *cool_dev;
	struct omap_bandgap *bg_ptr;
	enum thermal_device_mode mode;
	struct work_struct thermal_wq;
	int sensor_id;
	};

	static void omap_thermal_work(struct work_struct *work)
	{
	struct omap_thermal_data *data = container_of(work,
	struct omap_thermal_data, thermal_wq);

	thermal_zone_device_update(data->omap_thermal);

	dev_dbg(&data->omap_thermal->device, "updated thermal zone %s\n",
	data->omap_thermal->type);
	}

	/**
	* omap_thermal_hotspot_temperature - returns sensor extrapolated temperature
	* @t: omap sensor temperature
	* @s: omap sensor slope value
	* @c: omap sensor const value
	*/
	static inline int omap_thermal_hotspot_temperature(int t, int s, int c)
	{
	int delta = t * s / 1000 + c;

	if (delta < 0)
	delta = 0;

	return t + delta;
	}

	/* thermal zone ops */
	/* Get temperature callback function for thermal zone*/
	static inline int omap_thermal_get_temp(struct thermal_zone_device *thermal,
	unsigned long *temp)
	{
	struct omap_thermal_data *data = thermal->devdata;
	struct omap_bandgap *bg_ptr;
	struct omap_temp_sensor *s;
	int ret, tmp, pcb_temp, slope, constant;

	if (!data)
	return 0;

	bg_ptr = data->bg_ptr;
	s = &bg_ptr->conf->sensors[data->sensor_id];

	ret = omap_bandgap_read_temperature(bg_ptr, data->sensor_id, &tmp);
	if (ret)
	return ret;

	pcb_temp = 0;
	/* TODO: Introduce pcb temperature lookup */
	/* In case pcb zone is available, use the extrapolation rule with it */
	if (pcb_temp) {
	tmp -= pcb_temp;
	slope = s->slope_pcb;
	constant = s->constant_pcb;
	} else {
	slope = s->slope;
	constant = s->constant;
	}
	*temp = omap_thermal_hotspot_temperature(tmp, slope, constant);

	return ret;
	}

	/* Bind callback functions for thermal zone */
	static int omap_thermal_bind(struct thermal_zone_device *thermal,
	struct thermal_cooling_device *cdev)
	{
	struct omap_thermal_data *data = thermal->devdata;
	int max, id;

	if (IS_ERR_OR_NULL(data))
	return -ENODEV;

	/* check if this is the cooling device we registered */
	if (data->cool_dev != cdev)
	return 0;

	id = data->sensor_id;
	max = data->bg_ptr->conf->sensors[id].cooling_data.freq_clip_count;

	/* TODO: bind with min and max states */
	/* Simple thing, two trips, one passive another critical */
	return thermal_zone_bind_cooling_device(thermal, 0, cdev,
	THERMAL_NO_LIMIT,
	THERMAL_NO_LIMIT);
	}

	/* Unbind callback functions for thermal zone */
	static int omap_thermal_unbind(struct thermal_zone_device *thermal,
	struct thermal_cooling_device *cdev)
	{
	struct omap_thermal_data *data = thermal->devdata;

	if (IS_ERR_OR_NULL(data))
	return -ENODEV;

	/* check if this is the cooling device we registered */
	if (data->cool_dev != cdev)
	return 0;

	/* Simple thing, two trips, one passive another critical */
	return thermal_zone_unbind_cooling_device(thermal, 0, cdev);
	}

	/* Get mode callback functions for thermal zone */
	static int omap_thermal_get_mode(struct thermal_zone_device *thermal,
	enum thermal_device_mode *mode)
	{
	struct omap_thermal_data *data = thermal->devdata;

	if (data)
	*mode = data->mode;

	return 0;
	}

	/* Set mode callback functions for thermal zone */
	static int omap_thermal_set_mode(struct thermal_zone_device *thermal,
	enum thermal_device_mode mode)
	{
	struct omap_thermal_data *data = thermal->devdata;

	if (!data->omap_thermal) {
	dev_notice(&thermal->device, "thermal zone not registered\n");
	return 0;
	}

	mutex_lock(&data->omap_thermal->lock);

	if (mode == THERMAL_DEVICE_ENABLED)
	data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
	else
	data->omap_thermal->polling_delay = 0;

	mutex_unlock(&data->omap_thermal->lock);

	data->mode = mode;
	thermal_zone_device_update(data->omap_thermal);
	dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
	data->omap_thermal->polling_delay);

	return 0;
	}

	/* Get trip type callback functions for thermal zone */
	static int omap_thermal_get_trip_type(struct thermal_zone_device *thermal,
	int trip, enum thermal_trip_type *type)
	{
	if (!omap_thermal_is_valid_trip(trip))
	return -EINVAL;

	if (trip + 1 == OMAP_TRIP_NUMBER)
	*type = THERMAL_TRIP_CRITICAL;
	else
	*type = THERMAL_TRIP_PASSIVE;

	return 0;
	}

	/* Get trip temperature callback functions for thermal zone */
	static int omap_thermal_get_trip_temp(struct thermal_zone_device *thermal,
	int trip, unsigned long *temp)
	{
	if (!omap_thermal_is_valid_trip(trip))
	return -EINVAL;

	*temp = omap_thermal_get_trip_value(trip);

	return 0;
	}

	/* Get critical temperature callback functions for thermal zone */
	static int omap_thermal_get_crit_temp(struct thermal_zone_device *thermal,
	unsigned long *temp)
	{
	/* shutdown zone */
	return omap_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
	}

	static struct thermal_zone_device_ops omap_thermal_ops = {
	.get_temp = omap_thermal_get_temp,
	/* TODO: add .get_trend */
	.bind = omap_thermal_bind,
	.unbind = omap_thermal_unbind,
	.get_mode = omap_thermal_get_mode,
	.set_mode = omap_thermal_set_mode,
	.get_trip_type = omap_thermal_get_trip_type,
	.get_trip_temp = omap_thermal_get_trip_temp,
	.get_crit_temp = omap_thermal_get_crit_temp,
	};

	static struct omap_thermal_data
	omap_thermal_build_data(struct omap_bandgap bg_ptr, int id)
	{
	struct omap_thermal_data *data;

	data = devm_kzalloc(bg_ptr->dev, sizeof(*data), GFP_KERNEL);
	if (!data) {
	dev_err(bg_ptr->dev, "kzalloc fail\n");
	return NULL;
	}
	data->sensor_id = id;
	data->bg_ptr = bg_ptr;
	data->mode = THERMAL_DEVICE_ENABLED;
	INIT_WORK(&data->thermal_wq, omap_thermal_work);

	return data;
	}

	int omap_thermal_expose_sensor(struct omap_bandgap *bg_ptr, int id,
	char *domain)
	{
	struct omap_thermal_pdata pdata;

	data = omap_bandgap_get_sensor_data(bg_ptr, id);

	if (!data)
	data = omap_thermal_build_pdata(bg_ptr, id);

	if (!data)
	return -EINVAL;

	/* TODO: remove TC1 TC2 */
	/* Create thermal zone */
	data->omap_thermal = thermal_zone_device_register(domain,
	OMAP_TRIP_NUMBER, 0, data, &omap_thermal_ops,
	FAST_TEMP_MONITORING_RATE,
	FAST_TEMP_MONITORING_RATE);
	if (IS_ERR_OR_NULL(data->omap_thermal)) {
	dev_err(bg_ptr->dev, "thermal zone device is NULL\n");
	return PTR_ERR(data->omap_thermal);
	}
	data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
	omap_bandgap_set_sensor_data(bg_ptr, id, data);

	return 0;
	}

	int omap_thermal_remove_sensor(struct omap_bandgap *bg_ptr, int id)
	{
	struct omap_thermal_data *data;

	data = omap_bandgap_get_sensor_data(bg_ptr, id);

	thermal_zone_device_unregister(data->omap_thermal);

	return 0;
	}

	int omap_thermal_report_sensor_temperature(struct omap_bandgap *bg_ptr, int id)
	{
	struct omap_thermal_data *data;

	data = omap_bandgap_get_sensor_data(bg_ptr, id);

	schedule_work(&data->thermal_wq);

	return 0;
	}

	static int omap_thermal_build_cpufreq_clip(struct omap_bandgap *bg_ptr,
	struct freq_clip_table **tab_ptr,
	int *tab_size)
	{
	struct cpufreq_frequency_table *freq_table;
	struct freq_clip_table *tab;
	int i, count = 0;

	freq_table = cpufreq_frequency_get_table(0);
	if (IS_ERR_OR_NULL(freq_table)) {
	dev_err(bg_ptr->dev,
	"%s: failed to get cpufreq table (%p)\n",
	__func__, freq_table);
	return -EINVAL;
	}

	for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
	unsigned int freq = freq_table[i].frequency;
	if (freq == CPUFREQ_ENTRY_INVALID)
	continue;
	count++;
	}

	tab = devm_kzalloc(bg_ptr->dev, sizeof(tab) count, GFP_KERNEL);
	if (!tab) {
	dev_err(bg_ptr->dev,
	"%s: no memory available\n", __func__);
	return -ENOMEM;
	}

	for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
	unsigned int freq = freq_table[i].frequency;

	if (freq == CPUFREQ_ENTRY_INVALID)
	continue;

	tab[count - i - 1].freq_clip_max = freq;
	tab[count - i - 1].temp_level = OMAP_TRIP_HOT;
	tab[count - i - 1].mask_val = cpumask_of(0);
	}

	*tab_ptr = tab;
	*tab_size = count;

	return 0;
	}

	int omap_thermal_register_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
	{
	struct omap_thermal_data *data;
	struct freq_clip_table *tab_ptr;
	int tab_size, ret;

	data = omap_bandgap_get_sensor_data(bg_ptr, id);
	if (!data)
	data = omap_thermal_build_pdata(bg_ptr, id);

	if (!data)
	return -EINVAL;

	ret = omap_thermal_build_cpufreq_clip(bg_ptr, &tab_ptr, &tab_size);
	if (ret < 0) {
	dev_err(bg_ptr->dev,
	"%s: failed to build cpufreq clip table\n", __func__);
	return ret;
	}

	/* Register cooling device */
	data->cool_dev = cpufreq_cooling_register(tab_ptr, tab_size);
	if (IS_ERR_OR_NULL(data->cool_dev)) {
	dev_err(bg_ptr->dev,
	"Failed to register cpufreq cooling device\n");
	return PTR_ERR(data->cool_dev);
	}
	bg_ptr->conf->sensors[id].cooling_data.freq_clip_count = tab_size;
	omap_bandgap_set_sensor_data(bg_ptr, id, data);

	return 0;
	}

	int omap_thermal_unregister_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
	{
	struct omap_thermal_data *data;

	data = omap_bandgap_get_sensor_data(bg_ptr, id);
	cpufreq_cooling_unregister(data->cool_dev);

	return 0;
	}