[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/cpufreq.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);
}

/* 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 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_thermal_get_temp,
					__ti_thermal_get_trend);
	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;

	if (!cpufreq_get_current_driver()) {
		dev_dbg(bgp->dev, "no cpufreq driver yet\n");
		return -EPROBE_DEFER;
	}

	/* Register cooling device */
	data->cool_dev = cpufreq_cooling_register(cpu_present_mask);
	if (IS_ERR(data->cool_dev)) {
		dev_err(bgp->dev,
			"Failed to register cpufreq cooling device\n");
		return PTR_ERR(data->cool_dev);
	}
	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 && data->cool_dev)
		cpufreq_cooling_unregister(data->cool_dev);

	return 0;
}
Commit	Line	Data
445eaf87 EV	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/cpufreq.h>
5035d48d	32	#include <linux/cpumask.h>
445eaf87	33	#include <linux/cpu_cooling.h>
26d9cc65	34	#include <linux/of.h>
445eaf87	35
7372add4 EV	36	#include "ti-thermal.h"
7372add4 EV	37	#include "ti-bandgap.h"
445eaf87 EV	38
445eaf87 EV	39	/* common data structures */
03e859d3 EV	40	struct ti_thermal_data {
03e859d3 EV	41	struct thermal_zone_device *ti_thermal;
359836e1	42	struct thermal_zone_device *pcb_tz;
445eaf87	43	struct thermal_cooling_device *cool_dev;
03e859d3	44	struct ti_bandgap *bgp;
445eaf87 EV	45	enum thermal_device_mode mode;
	46	struct work_struct thermal_wq;
	47	int sensor_id;
26d9cc65	48	bool our_zone;
445eaf87 EV	49	};
445eaf87 EV	50
03e859d3	51	static void ti_thermal_work(struct work_struct *work)
445eaf87	52	{
03e859d3 EV	53	struct ti_thermal_data *data = container_of(work,
03e859d3 EV	54	struct ti_thermal_data, thermal_wq);
445eaf87	55
03e859d3	56	thermal_zone_device_update(data->ti_thermal);
445eaf87	57
03e859d3 EV	58	dev_dbg(&data->ti_thermal->device, "updated thermal zone %s\n",
03e859d3 EV	59	data->ti_thermal->type);
445eaf87 EV	60	}
	61
	62	/**
03e859d3	63	* ti_thermal_hotspot_temperature - returns sensor extrapolated temperature
445eaf87 EV	64	* @t: omap sensor temperature
	65	* @s: omap sensor slope value
	66	* @c: omap sensor const value
	67	*/
03e859d3	68	static inline int ti_thermal_hotspot_temperature(int t, int s, int c)
445eaf87 EV	69	{
	70	int delta = t * s / 1000 + c;
	71
	72	if (delta < 0)
	73	delta = 0;
	74
	75	return t + delta;
	76	}
	77
	78	/* thermal zone ops */
	79	/* Get temperature callback function for thermal zone*/
26d9cc65	80	static inline int __ti_thermal_get_temp(void devdata, long temp)
445eaf87	81	{
359836e1	82	struct thermal_zone_device *pcb_tz = NULL;
26d9cc65	83	struct ti_thermal_data *data = devdata;
03e859d3	84	struct ti_bandgap *bgp;
9879b2c4	85	const struct ti_temp_sensor *s;
359836e1 EV	86	int ret, tmp, slope, constant;
359836e1 EV	87	unsigned long pcb_temp;
445eaf87	88
04a4d10d EV	89	if (!data)
	90	return 0;
	91
d7f080e6 EV	92	bgp = data->bgp;
d7f080e6 EV	93	s = &bgp->conf->sensors[data->sensor_id];
04a4d10d	94
03e859d3	95	ret = ti_bandgap_read_temperature(bgp, data->sensor_id, &tmp);
445eaf87 EV	96	if (ret)
	97	return ret;
	98
359836e1 EV	99	/* Default constants */
	100	slope = s->slope;
	101	constant = s->constant;
	102
	103	pcb_tz = data->pcb_tz;
445eaf87	104	/* In case pcb zone is available, use the extrapolation rule with it */
0c12b5ac	105	if (!IS_ERR(pcb_tz)) {
359836e1 EV	106	ret = thermal_zone_get_temp(pcb_tz, &pcb_temp);
	107	if (!ret) {
	108	tmp -= pcb_temp; /* got a valid PCB temp */
	109	slope = s->slope_pcb;
	110	constant = s->constant_pcb;
	111	} else {
	112	dev_err(bgp->dev,
	113	"Failed to read PCB state. Using defaults\n");
df8f1347	114	ret = 0;
359836e1	115	}
445eaf87	116	}
03e859d3	117	*temp = ti_thermal_hotspot_temperature(tmp, slope, constant);
445eaf87 EV	118
	119	return ret;
	120	}
	121
26d9cc65 EV	122	static inline int ti_thermal_get_temp(struct thermal_zone_device *thermal,
	123	unsigned long *temp)
	124	{
	125	struct ti_thermal_data *data = thermal->devdata;
	126
	127	return __ti_thermal_get_temp(data, temp);
	128	}
	129
445eaf87	130	/* Bind callback functions for thermal zone */
03e859d3 EV	131	static int ti_thermal_bind(struct thermal_zone_device *thermal,
03e859d3 EV	132	struct thermal_cooling_device *cdev)
445eaf87	133	{
03e859d3	134	struct ti_thermal_data *data = thermal->devdata;
5035d48d	135	int id;
445eaf87	136
0c12b5ac	137	if (!data \|\| IS_ERR(data))
445eaf87 EV	138	return -ENODEV;
	139
	140	/* check if this is the cooling device we registered */
	141	if (data->cool_dev != cdev)
	142	return 0;
	143
	144	id = data->sensor_id;
445eaf87	145
445eaf87	146	/* Simple thing, two trips, one passive another critical */
a7a3b8c8	147	return thermal_zone_bind_cooling_device(thermal, 0, cdev,
67b4c474	148	/* bind with min and max states defined by cpu_cooling */
a7a3b8c8 EV	149	THERMAL_NO_LIMIT,
a7a3b8c8 EV	150	THERMAL_NO_LIMIT);
445eaf87 EV	151	}
	152
	153	/* Unbind callback functions for thermal zone */
03e859d3 EV	154	static int ti_thermal_unbind(struct thermal_zone_device *thermal,
03e859d3 EV	155	struct thermal_cooling_device *cdev)
445eaf87	156	{
03e859d3	157	struct ti_thermal_data *data = thermal->devdata;
445eaf87	158
0c12b5ac	159	if (!data \|\| IS_ERR(data))
445eaf87 EV	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 */
03e859d3 EV	171	static int ti_thermal_get_mode(struct thermal_zone_device *thermal,
03e859d3 EV	172	enum thermal_device_mode *mode)
445eaf87	173	{
03e859d3	174	struct ti_thermal_data *data = thermal->devdata;
445eaf87 EV	175
	176	if (data)
	177	*mode = data->mode;
	178
	179	return 0;
	180	}
	181
	182	/* Set mode callback functions for thermal zone */
03e859d3 EV	183	static int ti_thermal_set_mode(struct thermal_zone_device *thermal,
03e859d3 EV	184	enum thermal_device_mode mode)
445eaf87	185	{
03e859d3	186	struct ti_thermal_data *data = thermal->devdata;
10ccff1b RK	187	struct ti_bandgap *bgp;
	188
	189	bgp = data->bgp;
445eaf87	190
03e859d3	191	if (!data->ti_thermal) {
445eaf87 EV	192	dev_notice(&thermal->device, "thermal zone not registered\n");
	193	return 0;
	194	}
	195
03e859d3	196	mutex_lock(&data->ti_thermal->lock);
445eaf87 EV	197
445eaf87 EV	198	if (mode == THERMAL_DEVICE_ENABLED)
03e859d3	199	data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
445eaf87	200	else
03e859d3	201	data->ti_thermal->polling_delay = 0;
445eaf87	202
03e859d3	203	mutex_unlock(&data->ti_thermal->lock);
445eaf87 EV	204
445eaf87 EV	205	data->mode = mode;
10ccff1b RK	206	ti_bandgap_write_update_interval(bgp, data->sensor_id,
10ccff1b RK	207	data->ti_thermal->polling_delay);
03e859d3	208	thermal_zone_device_update(data->ti_thermal);
445eaf87	209	dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
03e859d3	210	data->ti_thermal->polling_delay);
445eaf87 EV	211
	212	return 0;
	213	}
	214
	215	/* Get trip type callback functions for thermal zone */
03e859d3 EV	216	static int ti_thermal_get_trip_type(struct thermal_zone_device *thermal,
03e859d3 EV	217	int trip, enum thermal_trip_type *type)
445eaf87	218	{
03e859d3	219	if (!ti_thermal_is_valid_trip(trip))
445eaf87 EV	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 */
03e859d3 EV	231	static int ti_thermal_get_trip_temp(struct thermal_zone_device *thermal,
03e859d3 EV	232	int trip, unsigned long *temp)
445eaf87	233	{
03e859d3	234	if (!ti_thermal_is_valid_trip(trip))
445eaf87 EV	235	return -EINVAL;
445eaf87 EV	236
03e859d3	237	*temp = ti_thermal_get_trip_value(trip);
445eaf87 EV	238
	239	return 0;
	240	}
	241
26d9cc65	242	static int __ti_thermal_get_trend(void p, long trend)
03b7f67b	243	{
26d9cc65	244	struct ti_thermal_data *data = p;
03b7f67b K	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
26d9cc65 EV	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
03b7f67b K	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
445eaf87	281	/* Get critical temperature callback functions for thermal zone */
03e859d3 EV	282	static int ti_thermal_get_crit_temp(struct thermal_zone_device *thermal,
03e859d3 EV	283	unsigned long *temp)
445eaf87 EV	284	{
445eaf87 EV	285	/* shutdown zone */
03e859d3	286	return ti_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
445eaf87 EV	287	}
445eaf87 EV	288
03e859d3 EV	289	static struct thermal_zone_device_ops ti_thermal_ops = {
03e859d3 EV	290	.get_temp = ti_thermal_get_temp,
03b7f67b	291	.get_trend = ti_thermal_get_trend,
03e859d3 EV	292	.bind = ti_thermal_bind,
	293	.unbind = ti_thermal_unbind,
	294	.get_mode = ti_thermal_get_mode,
	295	.set_mode = ti_thermal_set_mode,
	296	.get_trip_type = ti_thermal_get_trip_type,
	297	.get_trip_temp = ti_thermal_get_trip_temp,
	298	.get_crit_temp = ti_thermal_get_crit_temp,
445eaf87 EV	299	};
445eaf87 EV	300
03e859d3 EV	301	static struct ti_thermal_data
03e859d3 EV	302	ti_thermal_build_data(struct ti_bandgap bgp, int id)
445eaf87	303	{
03e859d3	304	struct ti_thermal_data *data;
445eaf87	305
d7f080e6	306	data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL);
445eaf87	307	if (!data) {
d7f080e6	308	dev_err(bgp->dev, "kzalloc fail\n");
04a4d10d	309	return NULL;
445eaf87 EV	310	}
445eaf87 EV	311	data->sensor_id = id;
d7f080e6	312	data->bgp = bgp;
445eaf87	313	data->mode = THERMAL_DEVICE_ENABLED;
0c12b5ac	314	/* pcb_tz will be either valid or PTR_ERR() */
359836e1	315	data->pcb_tz = thermal_zone_get_zone_by_name("pcb");
03e859d3	316	INIT_WORK(&data->thermal_wq, ti_thermal_work);
445eaf87	317
04a4d10d EV	318	return data;
	319	}
	320
03e859d3 EV	321	int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
03e859d3 EV	322	char *domain)
04a4d10d	323	{
03e859d3	324	struct ti_thermal_data *data;
04a4d10d	325
03e859d3	326	data = ti_bandgap_get_sensor_data(bgp, id);
04a4d10d	327
0c12b5ac	328	if (!data \|\| IS_ERR(data))
03e859d3	329	data = ti_thermal_build_data(bgp, id);
04a4d10d EV	330
	331	if (!data)
	332	return -EINVAL;
	333
26d9cc65 EV	334	/* in case this is specified by DT */
	335	data->ti_thermal = thermal_zone_of_sensor_register(bgp->dev, id,
	336	data, __ti_thermal_get_temp,
	337	__ti_thermal_get_trend);
	338	if (IS_ERR(data->ti_thermal)) {
	339	/* Create thermal zone */
	340	data->ti_thermal = thermal_zone_device_register(domain,
03e859d3	341	OMAP_TRIP_NUMBER, 0, data, &ti_thermal_ops,
50125a9b	342	NULL, FAST_TEMP_MONITORING_RATE,
765a1939	343	FAST_TEMP_MONITORING_RATE);
26d9cc65 EV	344	if (IS_ERR(data->ti_thermal)) {
	345	dev_err(bgp->dev, "thermal zone device is NULL\n");
	346	return PTR_ERR(data->ti_thermal);
	347	}
	348	data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
	349	data->our_zone = true;
445eaf87	350	}
03e859d3	351	ti_bandgap_set_sensor_data(bgp, id, data);
10ccff1b RK	352	ti_bandgap_write_update_interval(bgp, data->sensor_id,
10ccff1b RK	353	data->ti_thermal->polling_delay);
445eaf87 EV	354
	355	return 0;
	356	}
	357
03e859d3	358	int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id)
445eaf87	359	{
03e859d3	360	struct ti_thermal_data *data;
445eaf87	361
03e859d3	362	data = ti_bandgap_get_sensor_data(bgp, id);
445eaf87	363
26d9cc65 EV	364	if (data && data->ti_thermal) {
	365	if (data->our_zone)
	366	thermal_zone_device_unregister(data->ti_thermal);
	367	else
	368	thermal_zone_of_sensor_unregister(bgp->dev,
	369	data->ti_thermal);
	370	}
445eaf87 EV	371
	372	return 0;
	373	}
	374
03e859d3	375	int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id)
445eaf87	376	{
03e859d3	377	struct ti_thermal_data *data;
445eaf87	378
03e859d3	379	data = ti_bandgap_get_sensor_data(bgp, id);
445eaf87 EV	380
	381	schedule_work(&data->thermal_wq);
	382
	383	return 0;
	384	}
	385
03e859d3	386	int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id)
445eaf87	387	{
03e859d3	388	struct ti_thermal_data *data;
26d9cc65 EV	389	struct device_node *np = bgp->dev->of_node;
	390
	391	/*
	392	* We are assuming here that if one deploys the zone
	393	* using DT, then it must be aware that the cooling device
	394	* loading has to happen via cpufreq driver.
	395	*/
	396	if (of_find_property(np, "#thermal-sensor-cells", NULL))
	397	return 0;
445eaf87	398
03e859d3	399	data = ti_bandgap_get_sensor_data(bgp, id);
0c12b5ac	400	if (!data \|\| IS_ERR(data))
03e859d3	401	data = ti_thermal_build_data(bgp, id);
04a4d10d EV	402
	403	if (!data)
	404	return -EINVAL;
445eaf87	405
f1553334 EV	406	if (!cpufreq_get_current_driver()) {
	407	dev_dbg(bgp->dev, "no cpufreq driver yet\n");
	408	return -EPROBE_DEFER;
	409	}
	410
445eaf87	411	/* Register cooling device */
5035d48d	412	data->cool_dev = cpufreq_cooling_register(cpu_present_mask);
0c12b5ac	413	if (IS_ERR(data->cool_dev)) {
d7f080e6	414	dev_err(bgp->dev,
445eaf87 EV	415	"Failed to register cpufreq cooling device\n");
	416	return PTR_ERR(data->cool_dev);
	417	}
03e859d3	418	ti_bandgap_set_sensor_data(bgp, id, data);
445eaf87 EV	419
	420	return 0;
	421	}
	422
03e859d3	423	int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id)
445eaf87	424	{
03e859d3	425	struct ti_thermal_data *data;
445eaf87	426
03e859d3	427	data = ti_bandgap_get_sensor_data(bgp, id);
26d9cc65 EV	428
	429	if (data && data->cool_dev)
	430	cpufreq_cooling_unregister(data->cool_dev);
445eaf87 EV	431
	432	return 0;
	433	}