[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);
}

/* 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
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>
5035d48d	31	#include <linux/cpumask.h>
445eaf87	32	#include <linux/cpu_cooling.h>
26d9cc65	33	#include <linux/of.h>
445eaf87	34
7372add4 EV	35	#include "ti-thermal.h"
7372add4 EV	36	#include "ti-bandgap.h"
445eaf87 EV	37
445eaf87 EV	38	/* common data structures */
03e859d3 EV	39	struct ti_thermal_data {
03e859d3 EV	40	struct thermal_zone_device *ti_thermal;
359836e1	41	struct thermal_zone_device *pcb_tz;
445eaf87	42	struct thermal_cooling_device *cool_dev;
03e859d3	43	struct ti_bandgap *bgp;
445eaf87 EV	44	enum thermal_device_mode mode;
	45	struct work_struct thermal_wq;
	46	int sensor_id;
26d9cc65	47	bool our_zone;
445eaf87 EV	48	};
445eaf87 EV	49
03e859d3	50	static void ti_thermal_work(struct work_struct *work)
445eaf87	51	{
03e859d3 EV	52	struct ti_thermal_data *data = container_of(work,
03e859d3 EV	53	struct ti_thermal_data, thermal_wq);
445eaf87	54
03e859d3	55	thermal_zone_device_update(data->ti_thermal);
445eaf87	56
03e859d3 EV	57	dev_dbg(&data->ti_thermal->device, "updated thermal zone %s\n",
03e859d3 EV	58	data->ti_thermal->type);
445eaf87 EV	59	}
	60
	61	/**
03e859d3	62	* ti_thermal_hotspot_temperature - returns sensor extrapolated temperature
445eaf87 EV	63	* @t: omap sensor temperature
	64	* @s: omap sensor slope value
	65	* @c: omap sensor const value
	66	*/
03e859d3	67	static inline int ti_thermal_hotspot_temperature(int t, int s, int c)
445eaf87 EV	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*/
26d9cc65	79	static inline int __ti_thermal_get_temp(void devdata, long temp)
445eaf87	80	{
359836e1	81	struct thermal_zone_device *pcb_tz = NULL;
26d9cc65	82	struct ti_thermal_data *data = devdata;
03e859d3	83	struct ti_bandgap *bgp;
9879b2c4	84	const struct ti_temp_sensor *s;
359836e1 EV	85	int ret, tmp, slope, constant;
359836e1 EV	86	unsigned long pcb_temp;
445eaf87	87
04a4d10d EV	88	if (!data)
	89	return 0;
	90
d7f080e6 EV	91	bgp = data->bgp;
d7f080e6 EV	92	s = &bgp->conf->sensors[data->sensor_id];
04a4d10d	93
03e859d3	94	ret = ti_bandgap_read_temperature(bgp, data->sensor_id, &tmp);
445eaf87 EV	95	if (ret)
	96	return ret;
	97
359836e1 EV	98	/* Default constants */
	99	slope = s->slope;
	100	constant = s->constant;
	101
	102	pcb_tz = data->pcb_tz;
445eaf87	103	/* In case pcb zone is available, use the extrapolation rule with it */
0c12b5ac	104	if (!IS_ERR(pcb_tz)) {
359836e1 EV	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");
df8f1347	113	ret = 0;
359836e1	114	}
445eaf87	115	}
03e859d3	116	*temp = ti_thermal_hotspot_temperature(tmp, slope, constant);
445eaf87 EV	117
	118	return ret;
	119	}
	120
26d9cc65 EV	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
445eaf87	129	/* Bind callback functions for thermal zone */
03e859d3 EV	130	static int ti_thermal_bind(struct thermal_zone_device *thermal,
03e859d3 EV	131	struct thermal_cooling_device *cdev)
445eaf87	132	{
03e859d3	133	struct ti_thermal_data *data = thermal->devdata;
5035d48d	134	int id;
445eaf87	135
0c12b5ac	136	if (!data \|\| IS_ERR(data))
445eaf87 EV	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;
445eaf87	144
445eaf87	145	/* Simple thing, two trips, one passive another critical */
a7a3b8c8	146	return thermal_zone_bind_cooling_device(thermal, 0, cdev,
67b4c474	147	/* bind with min and max states defined by cpu_cooling */
a7a3b8c8 EV	148	THERMAL_NO_LIMIT,
a7a3b8c8 EV	149	THERMAL_NO_LIMIT);
445eaf87 EV	150	}
	151
	152	/* Unbind callback functions for thermal zone */
03e859d3 EV	153	static int ti_thermal_unbind(struct thermal_zone_device *thermal,
03e859d3 EV	154	struct thermal_cooling_device *cdev)
445eaf87	155	{
03e859d3	156	struct ti_thermal_data *data = thermal->devdata;
445eaf87	157
0c12b5ac	158	if (!data \|\| IS_ERR(data))
445eaf87 EV	159	return -ENODEV;
	160
	161	/* check if this is the cooling device we registered */
	162	if (data->cool_dev != cdev)
	163	return 0;
	164
	165	/* Simple thing, two trips, one passive another critical */
	166	return thermal_zone_unbind_cooling_device(thermal, 0, cdev);
	167	}
	168
	169	/* Get mode callback functions for thermal zone */
03e859d3 EV	170	static int ti_thermal_get_mode(struct thermal_zone_device *thermal,
03e859d3 EV	171	enum thermal_device_mode *mode)
445eaf87	172	{
03e859d3	173	struct ti_thermal_data *data = thermal->devdata;
445eaf87 EV	174
	175	if (data)
	176	*mode = data->mode;
	177
	178	return 0;
	179	}
	180
	181	/* Set mode callback functions for thermal zone */
03e859d3 EV	182	static int ti_thermal_set_mode(struct thermal_zone_device *thermal,
03e859d3 EV	183	enum thermal_device_mode mode)
445eaf87	184	{
03e859d3	185	struct ti_thermal_data *data = thermal->devdata;
10ccff1b RK	186	struct ti_bandgap *bgp;
	187
	188	bgp = data->bgp;
445eaf87	189
03e859d3	190	if (!data->ti_thermal) {
445eaf87 EV	191	dev_notice(&thermal->device, "thermal zone not registered\n");
	192	return 0;
	193	}
	194
03e859d3	195	mutex_lock(&data->ti_thermal->lock);
445eaf87 EV	196
445eaf87 EV	197	if (mode == THERMAL_DEVICE_ENABLED)
03e859d3	198	data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
445eaf87	199	else
03e859d3	200	data->ti_thermal->polling_delay = 0;
445eaf87	201
03e859d3	202	mutex_unlock(&data->ti_thermal->lock);
445eaf87 EV	203
445eaf87 EV	204	data->mode = mode;
10ccff1b RK	205	ti_bandgap_write_update_interval(bgp, data->sensor_id,
10ccff1b RK	206	data->ti_thermal->polling_delay);
03e859d3	207	thermal_zone_device_update(data->ti_thermal);
445eaf87	208	dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
03e859d3	209	data->ti_thermal->polling_delay);
445eaf87 EV	210
	211	return 0;
	212	}
	213
	214	/* Get trip type callback functions for thermal zone */
03e859d3 EV	215	static int ti_thermal_get_trip_type(struct thermal_zone_device *thermal,
03e859d3 EV	216	int trip, enum thermal_trip_type *type)
445eaf87	217	{
03e859d3	218	if (!ti_thermal_is_valid_trip(trip))
445eaf87 EV	219	return -EINVAL;
	220
	221	if (trip + 1 == OMAP_TRIP_NUMBER)
	222	*type = THERMAL_TRIP_CRITICAL;
	223	else
	224	*type = THERMAL_TRIP_PASSIVE;
	225
	226	return 0;
	227	}
	228
	229	/* Get trip temperature callback functions for thermal zone */
03e859d3 EV	230	static int ti_thermal_get_trip_temp(struct thermal_zone_device *thermal,
03e859d3 EV	231	int trip, unsigned long *temp)
445eaf87	232	{
03e859d3	233	if (!ti_thermal_is_valid_trip(trip))
445eaf87 EV	234	return -EINVAL;
445eaf87 EV	235
03e859d3	236	*temp = ti_thermal_get_trip_value(trip);
445eaf87 EV	237
	238	return 0;
	239	}
	240
26d9cc65	241	static int __ti_thermal_get_trend(void p, long trend)
03b7f67b	242	{
26d9cc65	243	struct ti_thermal_data *data = p;
03b7f67b K	244	struct ti_bandgap *bgp;
	245	int id, tr, ret = 0;
	246
	247	bgp = data->bgp;
	248	id = data->sensor_id;
	249
	250	ret = ti_bandgap_get_trend(bgp, id, &tr);
	251	if (ret)
	252	return ret;
	253
26d9cc65 EV	254	*trend = tr;
	255
	256	return 0;
	257	}
	258
	259	/* Get the temperature trend callback functions for thermal zone */
	260	static int ti_thermal_get_trend(struct thermal_zone_device *thermal,
	261	int trip, enum thermal_trend *trend)
	262	{
	263	int ret;
	264	long tr;
	265
	266	ret = __ti_thermal_get_trend(thermal->devdata, &tr);
	267	if (ret)
	268	return ret;
	269
03b7f67b K	270	if (tr > 0)
	271	*trend = THERMAL_TREND_RAISING;
	272	else if (tr < 0)
	273	*trend = THERMAL_TREND_DROPPING;
	274	else
	275	*trend = THERMAL_TREND_STABLE;
	276
	277	return 0;
	278	}
	279
445eaf87	280	/* Get critical temperature callback functions for thermal zone */
03e859d3 EV	281	static int ti_thermal_get_crit_temp(struct thermal_zone_device *thermal,
03e859d3 EV	282	unsigned long *temp)
445eaf87 EV	283	{
445eaf87 EV	284	/* shutdown zone */
03e859d3	285	return ti_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
445eaf87 EV	286	}
445eaf87 EV	287
2251aef6 EV	288	static const struct thermal_zone_of_device_ops ti_of_thermal_ops = {
	289	.get_temp = __ti_thermal_get_temp,
	290	.get_trend = __ti_thermal_get_trend,
	291	};
	292
03e859d3 EV	293	static struct thermal_zone_device_ops ti_thermal_ops = {
03e859d3 EV	294	.get_temp = ti_thermal_get_temp,
03b7f67b	295	.get_trend = ti_thermal_get_trend,
03e859d3 EV	296	.bind = ti_thermal_bind,
	297	.unbind = ti_thermal_unbind,
	298	.get_mode = ti_thermal_get_mode,
	299	.set_mode = ti_thermal_set_mode,
	300	.get_trip_type = ti_thermal_get_trip_type,
	301	.get_trip_temp = ti_thermal_get_trip_temp,
	302	.get_crit_temp = ti_thermal_get_crit_temp,
445eaf87 EV	303	};
445eaf87 EV	304
03e859d3 EV	305	static struct ti_thermal_data
03e859d3 EV	306	ti_thermal_build_data(struct ti_bandgap bgp, int id)
445eaf87	307	{
03e859d3	308	struct ti_thermal_data *data;
445eaf87	309
d7f080e6	310	data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL);
445eaf87	311	if (!data) {
d7f080e6	312	dev_err(bgp->dev, "kzalloc fail\n");
04a4d10d	313	return NULL;
445eaf87 EV	314	}
445eaf87 EV	315	data->sensor_id = id;
d7f080e6	316	data->bgp = bgp;
445eaf87	317	data->mode = THERMAL_DEVICE_ENABLED;
0c12b5ac	318	/* pcb_tz will be either valid or PTR_ERR() */
359836e1	319	data->pcb_tz = thermal_zone_get_zone_by_name("pcb");
03e859d3	320	INIT_WORK(&data->thermal_wq, ti_thermal_work);
445eaf87	321
04a4d10d EV	322	return data;
	323	}
	324
03e859d3 EV	325	int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
03e859d3 EV	326	char *domain)
04a4d10d	327	{
03e859d3	328	struct ti_thermal_data *data;
04a4d10d	329
03e859d3	330	data = ti_bandgap_get_sensor_data(bgp, id);
04a4d10d	331
0c12b5ac	332	if (!data \|\| IS_ERR(data))
03e859d3	333	data = ti_thermal_build_data(bgp, id);
04a4d10d EV	334
	335	if (!data)
	336	return -EINVAL;
	337
26d9cc65 EV	338	/* in case this is specified by DT */
26d9cc65 EV	339	data->ti_thermal = thermal_zone_of_sensor_register(bgp->dev, id,
2251aef6	340	data, &ti_of_thermal_ops);
26d9cc65 EV	341	if (IS_ERR(data->ti_thermal)) {
	342	/* Create thermal zone */
	343	data->ti_thermal = thermal_zone_device_register(domain,
03e859d3	344	OMAP_TRIP_NUMBER, 0, data, &ti_thermal_ops,
50125a9b	345	NULL, FAST_TEMP_MONITORING_RATE,
765a1939	346	FAST_TEMP_MONITORING_RATE);
26d9cc65 EV	347	if (IS_ERR(data->ti_thermal)) {
	348	dev_err(bgp->dev, "thermal zone device is NULL\n");
	349	return PTR_ERR(data->ti_thermal);
	350	}
	351	data->ti_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
	352	data->our_zone = true;
445eaf87	353	}
03e859d3	354	ti_bandgap_set_sensor_data(bgp, id, data);
10ccff1b RK	355	ti_bandgap_write_update_interval(bgp, data->sensor_id,
10ccff1b RK	356	data->ti_thermal->polling_delay);
445eaf87 EV	357
	358	return 0;
	359	}
	360
03e859d3	361	int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id)
445eaf87	362	{
03e859d3	363	struct ti_thermal_data *data;
445eaf87	364
03e859d3	365	data = ti_bandgap_get_sensor_data(bgp, id);
445eaf87	366
26d9cc65 EV	367	if (data && data->ti_thermal) {
	368	if (data->our_zone)
	369	thermal_zone_device_unregister(data->ti_thermal);
	370	else
	371	thermal_zone_of_sensor_unregister(bgp->dev,
	372	data->ti_thermal);
	373	}
445eaf87 EV	374
	375	return 0;
	376	}
	377
03e859d3	378	int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id)
445eaf87	379	{
03e859d3	380	struct ti_thermal_data *data;
445eaf87	381
03e859d3	382	data = ti_bandgap_get_sensor_data(bgp, id);
445eaf87 EV	383
	384	schedule_work(&data->thermal_wq);
	385
	386	return 0;
	387	}
	388
03e859d3	389	int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id)
445eaf87	390	{
03e859d3	391	struct ti_thermal_data *data;
26d9cc65 EV	392	struct device_node *np = bgp->dev->of_node;
	393
	394	/*
	395	* We are assuming here that if one deploys the zone
	396	* using DT, then it must be aware that the cooling device
	397	* loading has to happen via cpufreq driver.
	398	*/
	399	if (of_find_property(np, "#thermal-sensor-cells", NULL))
	400	return 0;
445eaf87	401
03e859d3	402	data = ti_bandgap_get_sensor_data(bgp, id);
0c12b5ac	403	if (!data \|\| IS_ERR(data))
03e859d3	404	data = ti_thermal_build_data(bgp, id);
04a4d10d EV	405
	406	if (!data)
	407	return -EINVAL;
445eaf87	408
445eaf87	409	/* Register cooling device */
5035d48d	410	data->cool_dev = cpufreq_cooling_register(cpu_present_mask);
0c12b5ac	411	if (IS_ERR(data->cool_dev)) {
cffafc32 EV	412	int ret = PTR_ERR(data->cool_dev);
	413
	414	if (ret != -EPROBE_DEFER)
	415	dev_err(bgp->dev,
	416	"Failed to register cpu cooling device %d\n",
	417	ret);
	418
	419	return ret;
445eaf87	420	}
03e859d3	421	ti_bandgap_set_sensor_data(bgp, id, data);
445eaf87 EV	422
	423	return 0;
	424	}
	425
03e859d3	426	int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id)
445eaf87	427	{
03e859d3	428	struct ti_thermal_data *data;
445eaf87	429
03e859d3	430	data = ti_bandgap_get_sensor_data(bgp, id);
26d9cc65	431
9ca9be2b	432	if (data)
26d9cc65	433	cpufreq_cooling_unregister(data->cool_dev);
445eaf87 EV	434
	435	return 0;
	436	}