drivers/thermal/ti-soc-thermal/ti-thermal-common.c - third_party/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/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 cpufreq_policy *policy;
 	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, THERMAL_EVENT_UNSPECIFIED);

 	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, int *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;
 	int 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 = thermal_zone_get_slope(data->ti_thermal);
 	constant = thermal_zone_get_offset(data->ti_thermal);

 	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,
 				      int *temp)
 {
 	struct ti_thermal_data *data = thermal->devdata;

 	return __ti_thermal_get_temp(data, temp);
 }

 static int __ti_thermal_get_trend(void *p, int trip, enum thermal_trend *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;

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

 	return 0;
 }

 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 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 = devm_thermal_zone_of_sensor_register(bgp->dev, id,
 					data, &ti_of_thermal_ops);
 	if (IS_ERR(data->ti_thermal)) {
 		dev_err(bgp->dev, "thermal zone device is NULL\n");
 		return PTR_ERR(data->ti_thermal);
 	}

 	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);
 	}

 	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;

 	data->policy = cpufreq_cpu_get(0);
 	if (!data->policy) {
 		pr_debug("%s: CPUFreq policy not found\n", __func__);
 		return -EPROBE_DEFER;
 	}

 	/* Register cooling device */
 	data->cool_dev = cpufreq_cooling_register(data->policy);
 	if (IS_ERR(data->cool_dev)) {
 		int ret = PTR_ERR(data->cool_dev);
 		dev_err(bgp->dev, "Failed to register cpu cooling device %d\n",
 			ret);
 		cpufreq_cpu_put(data->policy);

 		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);
 		if (data->policy)
 			cpufreq_cpu_put(data->policy);
 	}

 	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/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 cpufreq_policy *policy;
	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, THERMAL_EVENT_UNSPECIFIED);

	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, int 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;
	int 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 = thermal_zone_get_slope(data->ti_thermal);
	constant = thermal_zone_get_offset(data->ti_thermal);

	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,
	int *temp)
	{
	struct ti_thermal_data *data = thermal->devdata;

	return __ti_thermal_get_temp(data, temp);
	}

	static int __ti_thermal_get_trend(void p, int trip, enum thermal_trend 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;

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

	return 0;
	}

	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 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 = devm_thermal_zone_of_sensor_register(bgp->dev, id,
	data, &ti_of_thermal_ops);
	if (IS_ERR(data->ti_thermal)) {
	dev_err(bgp->dev, "thermal zone device is NULL\n");
	return PTR_ERR(data->ti_thermal);
	}

	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);
	}

	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;

	data->policy = cpufreq_cpu_get(0);
	if (!data->policy) {
	pr_debug("%s: CPUFreq policy not found\n", __func__);
	return -EPROBE_DEFER;
	}

	/* Register cooling device */
	data->cool_dev = cpufreq_cooling_register(data->policy);
	if (IS_ERR(data->cool_dev)) {
	int ret = PTR_ERR(data->cool_dev);
	dev_err(bgp->dev, "Failed to register cpu cooling device %d\n",
	ret);
	cpufreq_cpu_put(data->policy);

	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);
	if (data->policy)
	cpufreq_cpu_put(data->policy);
	}

	return 0;
	}