[deliverable/linux.git] / drivers / thermal / ti-soc-thermal / ti-thermal-common.c

/*
 * 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/cpumask.h>
#include <linux/cpu_cooling.h>
#include <linux/of.h>

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

/* common data structures */
struct ti_thermal_data {
	struct thermal_zone_device *ti_thermal;
	struct thermal_zone_device *pcb_tz;
	struct thermal_cooling_device *cool_dev;
	struct ti_bandgap *bgp;
	enum thermal_device_mode mode;
	struct work_struct thermal_wq;
	int sensor_id;
	bool our_zone;
};

static void ti_thermal_work(struct work_struct *work)
{
	struct ti_thermal_data *data = container_of(work,
					struct ti_thermal_data, thermal_wq);

	thermal_zone_device_update(data->ti_thermal);

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

/**
 * ti_thermal_hotspot_temperature - returns sensor extrapolated temperature
 * @t:	omap sensor temperature
 * @s:	omap sensor slope value
 * @c:	omap sensor const value
 */
static inline int ti_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 __ti_thermal_get_temp(void *devdata, long *temp)
{
	struct thermal_zone_device *pcb_tz = NULL;
	struct ti_thermal_data *data = devdata;
	struct ti_bandgap *bgp;
	const struct ti_temp_sensor *s;
	int ret, tmp, slope, constant;
	unsigned long pcb_temp;

	if (!data)
		return 0;

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

	ret = ti_bandgap_read_temperature(bgp, data->sensor_id, &tmp);
	if (ret)
		return ret;

	/* Default constants */
	slope = s->slope;
	constant = s->constant;

	pcb_tz = data->pcb_tz;
	/* In case pcb zone is available, use the extrapolation rule with it */
	if (!IS_ERR(pcb_tz)) {
		ret = thermal_zone_get_temp(pcb_tz, &pcb_temp);
		if (!ret) {
			tmp -= pcb_temp; /* got a valid PCB temp */
			slope = s->slope_pcb;
			constant = s->constant_pcb;
		} else {
			dev_err(bgp->dev,
				"Failed to read PCB state. Using defaults\n");
			ret = 0;
		}
	}
	*temp = ti_thermal_hotspot_temperature(tmp, slope, constant);

	return ret;
}

static inline int ti_thermal_get_temp(struct thermal_zone_device *thermal,
				      unsigned long *temp)
{
	struct ti_thermal_data *data = thermal->devdata;

	return __ti_thermal_get_temp(data, temp);
}

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

	if (!data || IS_ERR(data))
		return -ENODEV;

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

	id = data->sensor_id;

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

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

	if (!data || IS_ERR(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 ti_thermal_get_mode(struct thermal_zone_device *thermal,
			       enum thermal_device_mode *mode)
{
	struct ti_thermal_data *data = thermal->devdata;

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

	return 0;
}

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

	bgp = data->bgp;

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

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

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

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

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

	return 0;
}

/* Get trip type callback functions for thermal zone */
static int ti_thermal_get_trip_type(struct thermal_zone_device *thermal,
				    int trip, enum thermal_trip_type *type)
{
	if (!ti_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 ti_thermal_get_trip_temp(struct thermal_zone_device *thermal,
				    int trip, unsigned long *temp)
{
	if (!ti_thermal_is_valid_trip(trip))
		return -EINVAL;

	*temp = ti_thermal_get_trip_value(trip);

	return 0;
}

static int __ti_thermal_get_trend(void *p, long *trend)
{
	struct ti_thermal_data *data = p;
	struct ti_bandgap *bgp;
	int id, tr, ret = 0;

	bgp = data->bgp;
	id = data->sensor_id;

	ret = ti_bandgap_get_trend(bgp, id, &tr);
	if (ret)
		return ret;

	*trend = tr;

	return 0;
}

/* Get the temperature trend callback functions for thermal zone */
static int ti_thermal_get_trend(struct thermal_zone_device *thermal,
				int trip, enum thermal_trend *trend)
{
	int ret;
	long tr;

	ret = __ti_thermal_get_trend(thermal->devdata, &tr);
	if (ret)
		return ret;

	if (tr > 0)
		*trend = THERMAL_TREND_RAISING;
	else if (tr < 0)
		*trend = THERMAL_TREND_DROPPING;
	else
		*trend = THERMAL_TREND_STABLE;

	return 0;
}

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

static const struct thermal_zone_of_device_ops ti_of_thermal_ops = {
	.get_temp = __ti_thermal_get_temp,
	.get_trend = __ti_thermal_get_trend,
};

static struct thermal_zone_device_ops ti_thermal_ops = {
	.get_temp = ti_thermal_get_temp,
	.get_trend = ti_thermal_get_trend,
	.bind = ti_thermal_bind,
	.unbind = ti_thermal_unbind,
	.get_mode = ti_thermal_get_mode,
	.set_mode = ti_thermal_set_mode,
	.get_trip_type = ti_thermal_get_trip_type,
	.get_trip_temp = ti_thermal_get_trip_temp,
	.get_crit_temp = ti_thermal_get_crit_temp,
};

static struct ti_thermal_data
*ti_thermal_build_data(struct ti_bandgap *bgp, int id)
{
	struct ti_thermal_data *data;

	data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL);
	if (!data) {
		dev_err(bgp->dev, "kzalloc fail\n");
		return NULL;
	}
	data->sensor_id = id;
	data->bgp = bgp;
	data->mode = THERMAL_DEVICE_ENABLED;
	/* pcb_tz will be either valid or PTR_ERR() */
	data->pcb_tz = thermal_zone_get_zone_by_name("pcb");
	INIT_WORK(&data->thermal_wq, ti_thermal_work);

	return data;
}

int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
			     char *domain)
{
	struct ti_thermal_data *data;

	data = ti_bandgap_get_sensor_data(bgp, id);

	if (!data || IS_ERR(data))
		data = ti_thermal_build_data(bgp, id);

	if (!data)
		return -EINVAL;

	/* in case this is specified by DT */
	data->ti_thermal = thermal_zone_of_sensor_register(bgp->dev, id,
					data, &ti_of_thermal_ops);
	if (IS_ERR(data->ti_thermal)) {
		/* Create thermal zone */
		data->ti_thermal = thermal_zone_device_register(domain,
				OMAP_TRIP_NUMBER, 0, data, &ti_thermal_ops,
				NULL, FAST_TEMP_MONITORING_RATE,
				FAST_TEMP_MONITORING_RATE);
		if (IS_ERR(data->ti_thermal)) {
			dev_err(bgp->dev, "thermal zone device is NULL\n");
			return PTR_ERR(data->ti_thermal);
		}
		data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
		data->our_zone = true;
	}
	ti_bandgap_set_sensor_data(bgp, id, data);
	ti_bandgap_write_update_interval(bgp, data->sensor_id,
					data->ti_thermal->polling_delay);

	return 0;
}

int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id)
{
	struct ti_thermal_data *data;

	data = ti_bandgap_get_sensor_data(bgp, id);

	if (data && data->ti_thermal) {
		if (data->our_zone)
			thermal_zone_device_unregister(data->ti_thermal);
		else
			thermal_zone_of_sensor_unregister(bgp->dev,
							  data->ti_thermal);
	}

	return 0;
}

int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id)
{
	struct ti_thermal_data *data;

	data = ti_bandgap_get_sensor_data(bgp, id);

	schedule_work(&data->thermal_wq);

	return 0;
}

int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id)
{
	struct ti_thermal_data *data;
	struct device_node *np = bgp->dev->of_node;

	/*
	 * We are assuming here that if one deploys the zone
	 * using DT, then it must be aware that the cooling device
	 * loading has to happen via cpufreq driver.
	 */
	if (of_find_property(np, "#thermal-sensor-cells", NULL))
		return 0;

	data = ti_bandgap_get_sensor_data(bgp, id);
	if (!data || IS_ERR(data))
		data = ti_thermal_build_data(bgp, id);

	if (!data)
		return -EINVAL;

	/* Register cooling device */
	data->cool_dev = cpufreq_cooling_register(cpu_present_mask);
	if (IS_ERR(data->cool_dev)) {
		int ret = PTR_ERR(data->cool_dev);

		if (ret != -EPROBE_DEFER)
			dev_err(bgp->dev,
				"Failed to register cpu cooling device %d\n",
				ret);

		return ret;
	}
	ti_bandgap_set_sensor_data(bgp, id, data);

	return 0;
}

int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id)
{
	struct ti_thermal_data *data;

	data = ti_bandgap_get_sensor_data(bgp, id);

	if (data)
		cpufreq_cooling_unregister(data->cool_dev);

	return 0;
}
Commit	Line	Data
	1	/*
	2	* OMAP thermal driver interface
	3	*
	4	* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
	5	* Contact:
	6	* Eduardo Valentin <eduardo.valentin@ti.com>
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* version 2 as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	20	* 02110-1301 USA
	21	*
	22	*/
	23
	24	#include <linux/device.h>
	25	#include <linux/err.h>
	26	#include <linux/mutex.h>
	27	#include <linux/gfp.h>
	28	#include <linux/kernel.h>
	29	#include <linux/workqueue.h>
	30	#include <linux/thermal.h>
	31	#include <linux/cpumask.h>
	32	#include <linux/cpu_cooling.h>
	33	#include <linux/of.h>
	34
	35	#include "ti-thermal.h"
	36	#include "ti-bandgap.h"
	37
	38	/* common data structures */
	39	struct ti_thermal_data {
	40	struct thermal_zone_device *ti_thermal;
	41	struct thermal_zone_device *pcb_tz;
	42	struct thermal_cooling_device *cool_dev;
	43	struct ti_bandgap *bgp;
	44	enum thermal_device_mode mode;
	45	struct work_struct thermal_wq;
	46	int sensor_id;
	47	bool our_zone;
	48	};
	49
	50	static void ti_thermal_work(struct work_struct *work)
	51	{
	52	struct ti_thermal_data *data = container_of(work,
	53	struct ti_thermal_data, thermal_wq);
	54
	55	thermal_zone_device_update(data->ti_thermal);
	56
	57	dev_dbg(&data->ti_thermal->device, "updated thermal zone %s\n",
	58	data->ti_thermal->type);
	59	}
	60
	61	/**
	62	* ti_thermal_hotspot_temperature - returns sensor extrapolated temperature
	63	* @t: omap sensor temperature
	64	* @s: omap sensor slope value
	65	* @c: omap sensor const value
	66	*/
	67	static inline int ti_thermal_hotspot_temperature(int t, int s, int c)
	68	{
	69	int delta = t * s / 1000 + c;
	70
	71	if (delta < 0)
	72	delta = 0;
	73
	74	return t + delta;
	75	}
	76
	77	/* thermal zone ops */
	78	/* Get temperature callback function for thermal zone*/
	79	static inline int __ti_thermal_get_temp(void devdata, long temp)
	80	{
	81	struct thermal_zone_device *pcb_tz = NULL;
	82	struct ti_thermal_data *data = devdata;
	83	struct ti_bandgap *bgp;
	84	const struct ti_temp_sensor *s;
	85	int ret, tmp, slope, constant;
	86	unsigned long pcb_temp;
	87
	88	if (!data)
	89	return 0;
	90
	91	bgp = data->bgp;
	92	s = &bgp->conf->sensors[data->sensor_id];
	93
	94	ret = ti_bandgap_read_temperature(bgp, data->sensor_id, &tmp);
	95	if (ret)
	96	return ret;
	97
	98	/* Default constants */
	99	slope = s->slope;
	100	constant = s->constant;
	101
	102	pcb_tz = data->pcb_tz;
	103	/* In case pcb zone is available, use the extrapolation rule with it */
	104	if (!IS_ERR(pcb_tz)) {
	105	ret = thermal_zone_get_temp(pcb_tz, &pcb_temp);
	106	if (!ret) {
	107	tmp -= pcb_temp; /* got a valid PCB temp */
	108	slope = s->slope_pcb;
	109	constant = s->constant_pcb;
	110	} else {
	111	dev_err(bgp->dev,
	112	"Failed to read PCB state. Using defaults\n");
	113	ret = 0;
	114	}
	115	}
	116	*temp = ti_thermal_hotspot_temperature(tmp, slope, constant);
	117
	118	return ret;
	119	}
	120
	121	static inline int ti_thermal_get_temp(struct thermal_zone_device *thermal,
	122	unsigned long *temp)
	123	{
	124	struct ti_thermal_data *data = thermal->devdata;
	125
	126	return __ti_thermal_get_temp(data, temp);
	127	}
	128
	129	/* Bind callback functions for thermal zone */
	130	static int ti_thermal_bind(struct thermal_zone_device *thermal,
	131	struct thermal_cooling_device *cdev)
	132	{
	133	struct ti_thermal_data *data = thermal->devdata;
	134	int id;
	135
	136	if (!data \|\| IS_ERR(data))
	137	return -ENODEV;
	138
	139	/* check if this is the cooling device we registered */
	140	if (data->cool_dev != cdev)
	141	return 0;
	142
	143	id = data->sensor_id;
	144
	145	/* Simple thing, two trips, one passive another critical */
	146	return thermal_zone_bind_cooling_device(thermal, 0, cdev,
	147	/* bind with min and max states defined by cpu_cooling */
	148	THERMAL_NO_LIMIT,
	149	THERMAL_NO_LIMIT,
	150	THERMAL_WEIGHT_DEFAULT);
	151	}
	152
	153	/* Unbind callback functions for thermal zone */
	154	static int ti_thermal_unbind(struct thermal_zone_device *thermal,
	155	struct thermal_cooling_device *cdev)
	156	{
	157	struct ti_thermal_data *data = thermal->devdata;
	158
	159	if (!data \|\| IS_ERR(data))
	160	return -ENODEV;
	161
	162	/* check if this is the cooling device we registered */
	163	if (data->cool_dev != cdev)
	164	return 0;
	165
	166	/* Simple thing, two trips, one passive another critical */
	167	return thermal_zone_unbind_cooling_device(thermal, 0, cdev);
	168	}
	169
	170	/* Get mode callback functions for thermal zone */
	171	static int ti_thermal_get_mode(struct thermal_zone_device *thermal,
	172	enum thermal_device_mode *mode)
	173	{
	174	struct ti_thermal_data *data = thermal->devdata;
	175
	176	if (data)
	177	*mode = data->mode;
	178
	179	return 0;
	180	}
	181
	182	/* Set mode callback functions for thermal zone */
	183	static int ti_thermal_set_mode(struct thermal_zone_device *thermal,
	184	enum thermal_device_mode mode)
	185	{
	186	struct ti_thermal_data *data = thermal->devdata;
	187	struct ti_bandgap *bgp;
	188
	189	bgp = data->bgp;
	190
	191	if (!data->ti_thermal) {
	192	dev_notice(&thermal->device, "thermal zone not registered\n");
	193	return 0;
	194	}
	195
	196	mutex_lock(&data->ti_thermal->lock);
	197
	198	if (mode == THERMAL_DEVICE_ENABLED)
	199	data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
	200	else
	201	data->ti_thermal->polling_delay = 0;
	202
	203	mutex_unlock(&data->ti_thermal->lock);
	204
	205	data->mode = mode;
	206	ti_bandgap_write_update_interval(bgp, data->sensor_id,
	207	data->ti_thermal->polling_delay);
	208	thermal_zone_device_update(data->ti_thermal);
	209	dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
	210	data->ti_thermal->polling_delay);
	211
	212	return 0;
	213	}
	214
	215	/* Get trip type callback functions for thermal zone */
	216	static int ti_thermal_get_trip_type(struct thermal_zone_device *thermal,
	217	int trip, enum thermal_trip_type *type)
	218	{
	219	if (!ti_thermal_is_valid_trip(trip))
	220	return -EINVAL;
	221
	222	if (trip + 1 == OMAP_TRIP_NUMBER)
	223	*type = THERMAL_TRIP_CRITICAL;
	224	else
	225	*type = THERMAL_TRIP_PASSIVE;
	226
	227	return 0;
	228	}
	229
	230	/* Get trip temperature callback functions for thermal zone */
	231	static int ti_thermal_get_trip_temp(struct thermal_zone_device *thermal,
	232	int trip, unsigned long *temp)
	233	{
	234	if (!ti_thermal_is_valid_trip(trip))
	235	return -EINVAL;
	236
	237	*temp = ti_thermal_get_trip_value(trip);
	238
	239	return 0;
	240	}
	241
	242	static int __ti_thermal_get_trend(void p, long trend)
	243	{
	244	struct ti_thermal_data *data = p;
	245	struct ti_bandgap *bgp;
	246	int id, tr, ret = 0;
	247
	248	bgp = data->bgp;
	249	id = data->sensor_id;
	250
	251	ret = ti_bandgap_get_trend(bgp, id, &tr);
	252	if (ret)
	253	return ret;
	254
	255	*trend = tr;
	256
	257	return 0;
	258	}
	259
	260	/* Get the temperature trend callback functions for thermal zone */
	261	static int ti_thermal_get_trend(struct thermal_zone_device *thermal,
	262	int trip, enum thermal_trend *trend)
	263	{
	264	int ret;
	265	long tr;
	266
	267	ret = __ti_thermal_get_trend(thermal->devdata, &tr);
	268	if (ret)
	269	return ret;
	270
	271	if (tr > 0)
	272	*trend = THERMAL_TREND_RAISING;
	273	else if (tr < 0)
	274	*trend = THERMAL_TREND_DROPPING;
	275	else
	276	*trend = THERMAL_TREND_STABLE;
	277
	278	return 0;
	279	}
	280
	281	/* Get critical temperature callback functions for thermal zone */
	282	static int ti_thermal_get_crit_temp(struct thermal_zone_device *thermal,
	283	unsigned long *temp)
	284	{
	285	/* shutdown zone */
	286	return ti_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
	287	}
	288
	289	static const struct thermal_zone_of_device_ops ti_of_thermal_ops = {
	290	.get_temp = __ti_thermal_get_temp,
	291	.get_trend = __ti_thermal_get_trend,
	292	};
	293
	294	static struct thermal_zone_device_ops ti_thermal_ops = {
	295	.get_temp = ti_thermal_get_temp,
	296	.get_trend = ti_thermal_get_trend,
	297	.bind = ti_thermal_bind,
	298	.unbind = ti_thermal_unbind,
	299	.get_mode = ti_thermal_get_mode,
	300	.set_mode = ti_thermal_set_mode,
	301	.get_trip_type = ti_thermal_get_trip_type,
	302	.get_trip_temp = ti_thermal_get_trip_temp,
	303	.get_crit_temp = ti_thermal_get_crit_temp,
	304	};
	305
	306	static struct ti_thermal_data
	307	ti_thermal_build_data(struct ti_bandgap bgp, int id)
	308	{
	309	struct ti_thermal_data *data;
	310
	311	data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL);
	312	if (!data) {
	313	dev_err(bgp->dev, "kzalloc fail\n");
	314	return NULL;
	315	}
	316	data->sensor_id = id;
	317	data->bgp = bgp;
	318	data->mode = THERMAL_DEVICE_ENABLED;
	319	/* pcb_tz will be either valid or PTR_ERR() */
	320	data->pcb_tz = thermal_zone_get_zone_by_name("pcb");
	321	INIT_WORK(&data->thermal_wq, ti_thermal_work);
	322
	323	return data;
	324	}
	325
	326	int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
	327	char *domain)
	328	{
	329	struct ti_thermal_data *data;
	330
	331	data = ti_bandgap_get_sensor_data(bgp, id);
	332
	333	if (!data \|\| IS_ERR(data))
	334	data = ti_thermal_build_data(bgp, id);
	335
	336	if (!data)
	337	return -EINVAL;
	338
	339	/* in case this is specified by DT */
	340	data->ti_thermal = thermal_zone_of_sensor_register(bgp->dev, id,
	341	data, &ti_of_thermal_ops);
	342	if (IS_ERR(data->ti_thermal)) {
	343	/* Create thermal zone */
	344	data->ti_thermal = thermal_zone_device_register(domain,
	345	OMAP_TRIP_NUMBER, 0, data, &ti_thermal_ops,
	346	NULL, FAST_TEMP_MONITORING_RATE,
	347	FAST_TEMP_MONITORING_RATE);
	348	if (IS_ERR(data->ti_thermal)) {
	349	dev_err(bgp->dev, "thermal zone device is NULL\n");
	350	return PTR_ERR(data->ti_thermal);
	351	}
	352	data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
	353	data->our_zone = true;
	354	}
	355	ti_bandgap_set_sensor_data(bgp, id, data);
	356	ti_bandgap_write_update_interval(bgp, data->sensor_id,
	357	data->ti_thermal->polling_delay);
	358
	359	return 0;
	360	}
	361
	362	int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id)
	363	{
	364	struct ti_thermal_data *data;
	365
	366	data = ti_bandgap_get_sensor_data(bgp, id);
	367
	368	if (data && data->ti_thermal) {
	369	if (data->our_zone)
	370	thermal_zone_device_unregister(data->ti_thermal);
	371	else
	372	thermal_zone_of_sensor_unregister(bgp->dev,
	373	data->ti_thermal);
	374	}
	375
	376	return 0;
	377	}
	378
	379	int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id)
	380	{
	381	struct ti_thermal_data *data;
	382
	383	data = ti_bandgap_get_sensor_data(bgp, id);
	384
	385	schedule_work(&data->thermal_wq);
	386
	387	return 0;
	388	}
	389
	390	int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id)
	391	{
	392	struct ti_thermal_data *data;
	393	struct device_node *np = bgp->dev->of_node;
	394
	395	/*
	396	* We are assuming here that if one deploys the zone
	397	* using DT, then it must be aware that the cooling device
	398	* loading has to happen via cpufreq driver.
	399	*/
	400	if (of_find_property(np, "#thermal-sensor-cells", NULL))
	401	return 0;
	402
	403	data = ti_bandgap_get_sensor_data(bgp, id);
	404	if (!data \|\| IS_ERR(data))
	405	data = ti_thermal_build_data(bgp, id);
	406
	407	if (!data)
	408	return -EINVAL;
	409
	410	/* Register cooling device */
	411	data->cool_dev = cpufreq_cooling_register(cpu_present_mask);
	412	if (IS_ERR(data->cool_dev)) {
	413	int ret = PTR_ERR(data->cool_dev);
	414
	415	if (ret != -EPROBE_DEFER)
	416	dev_err(bgp->dev,
	417	"Failed to register cpu cooling device %d\n",
	418	ret);
	419
	420	return ret;
	421	}
	422	ti_bandgap_set_sensor_data(bgp, id, data);
	423
	424	return 0;
	425	}
	426
	427	int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id)
	428	{
	429	struct ti_thermal_data *data;
	430
	431	data = ti_bandgap_get_sensor_data(bgp, id);
	432
	433	if (data)
	434	cpufreq_cooling_unregister(data->cool_dev);
	435
	436	return 0;
	437	}