drivers/thermal/da9062-thermal.c - linux-imx - Git at Google

 /*
  * Thermal device driver for DA9062 and DA9061
  * Copyright (C) 2017  Dialog Semiconductor
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version 2
  * of the License, or (at your option) any later version.
  *
  * 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.
  */

 /* When over-temperature is reached, an interrupt from the device will be
  * triggered. Following this event the interrupt will be disabled and
  * periodic transmission of uevents (HOT trip point) should define the
  * first level of temperature supervision. It is expected that any final
  * implementation of the thermal driver will include a .notify() function
  * to implement these uevents to userspace.
  *
  * These uevents are intended to indicate non-invasive temperature control
  * of the system, where the necessary measures for cooling are the
  * responsibility of the host software. Once the temperature falls again,
  * the IRQ is re-enabled so the start of a new over-temperature event can
  * be detected without constant software monitoring.
  */

 #include <linux/errno.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/thermal.h>
 #include <linux/workqueue.h>

 #include <linux/mfd/da9062/core.h>
 #include <linux/mfd/da9062/registers.h>

 /* Minimum, maximum and default polling millisecond periods are provided
  * here as an example. It is expected that any final implementation to also
  * include a modification of these settings to match the required
  * application.
  */
 #define DA9062_DEFAULT_POLLING_MS_PERIOD	3000
 #define DA9062_MAX_POLLING_MS_PERIOD		10000
 #define DA9062_MIN_POLLING_MS_PERIOD		1000

 #define DA9062_MILLI_CELSIUS(t)			((t) * 1000)

 struct da9062_thermal_config {
 	const char *name;
 };

 struct da9062_thermal {
 	struct da9062 *hw;
 	struct delayed_work work;
 	struct thermal_zone_device *zone;
 	enum thermal_device_mode mode;
 	struct mutex lock; /* protection for da9062_thermal temperature */
 	int temperature;
 	int irq;
 	const struct da9062_thermal_config *config;
 	struct device *dev;
 };

 static void da9062_thermal_poll_on(struct work_struct *work)
 {
 	struct da9062_thermal *thermal = container_of(work,
 						struct da9062_thermal,
 						work.work);
 	unsigned long delay;
 	unsigned int val;
 	int ret;

 	/* clear E_TEMP */
 	ret = regmap_write(thermal->hw->regmap,
 			   DA9062AA_EVENT_B,
 			   DA9062AA_E_TEMP_MASK);
 	if (ret < 0) {
 		dev_err(thermal->dev,
 			"Cannot clear the TJUNC temperature status\n");
 		goto err_enable_irq;
 	}

 	/* Now read E_TEMP again: it is acting like a status bit.
 	 * If over-temperature, then this status will be true.
 	 * If not over-temperature, this status will be false.
 	 */
 	ret = regmap_read(thermal->hw->regmap,
 			  DA9062AA_EVENT_B,
 			  &val);
 	if (ret < 0) {
 		dev_err(thermal->dev,
 			"Cannot check the TJUNC temperature status\n");
 		goto err_enable_irq;
 	}

 	if (val & DA9062AA_E_TEMP_MASK) {
 		mutex_lock(&thermal->lock);
 		thermal->temperature = DA9062_MILLI_CELSIUS(125);
 		mutex_unlock(&thermal->lock);
 		thermal_zone_device_update(thermal->zone,
 					   THERMAL_EVENT_UNSPECIFIED);

 		delay = msecs_to_jiffies(thermal->zone->passive_delay);
 		queue_delayed_work(system_freezable_wq, &thermal->work, delay);
 		return;
 	}

 	mutex_lock(&thermal->lock);
 	thermal->temperature = DA9062_MILLI_CELSIUS(0);
 	mutex_unlock(&thermal->lock);
 	thermal_zone_device_update(thermal->zone,
 				   THERMAL_EVENT_UNSPECIFIED);

 err_enable_irq:
 	enable_irq(thermal->irq);
 }

 static irqreturn_t da9062_thermal_irq_handler(int irq, void *data)
 {
 	struct da9062_thermal *thermal = data;

 	disable_irq_nosync(thermal->irq);
 	queue_delayed_work(system_freezable_wq, &thermal->work, 0);

 	return IRQ_HANDLED;
 }

 static int da9062_thermal_get_mode(struct thermal_zone_device *z,
 				   enum thermal_device_mode *mode)
 {
 	struct da9062_thermal *thermal = z->devdata;
 	*mode = thermal->mode;
 	return 0;
 }

 static int da9062_thermal_get_trip_type(struct thermal_zone_device *z,
 					int trip,
 					enum thermal_trip_type *type)
 {
 	struct da9062_thermal *thermal = z->devdata;

 	switch (trip) {
 	case 0:
 		*type = THERMAL_TRIP_HOT;
 		break;
 	default:
 		dev_err(thermal->dev,
 			"Driver does not support more than 1 trip-wire\n");
 		return -EINVAL;
 	}

 	return 0;
 }

 static int da9062_thermal_get_trip_temp(struct thermal_zone_device *z,
 					int trip,
 					int *temp)
 {
 	struct da9062_thermal *thermal = z->devdata;

 	switch (trip) {
 	case 0:
 		*temp = DA9062_MILLI_CELSIUS(125);
 		break;
 	default:
 		dev_err(thermal->dev,
 			"Driver does not support more than 1 trip-wire\n");
 		return -EINVAL;
 	}

 	return 0;
 }

 static int da9062_thermal_get_temp(struct thermal_zone_device *z,
 				   int *temp)
 {
 	struct da9062_thermal *thermal = z->devdata;

 	mutex_lock(&thermal->lock);
 	*temp = thermal->temperature;
 	mutex_unlock(&thermal->lock);

 	return 0;
 }

 static struct thermal_zone_device_ops da9062_thermal_ops = {
 	.get_temp	= da9062_thermal_get_temp,
 	.get_mode	= da9062_thermal_get_mode,
 	.get_trip_type	= da9062_thermal_get_trip_type,
 	.get_trip_temp	= da9062_thermal_get_trip_temp,
 };

 static const struct da9062_thermal_config da9062_config = {
 	.name = "da9062-thermal",
 };

 static const struct of_device_id da9062_compatible_reg_id_table[] = {
 	{ .compatible = "dlg,da9062-thermal", .data = &da9062_config },
 	{ },
 };

 MODULE_DEVICE_TABLE(of, da9062_compatible_reg_id_table);

 static int da9062_thermal_probe(struct platform_device *pdev)
 {
 	struct da9062 *chip = dev_get_drvdata(pdev->dev.parent);
 	struct da9062_thermal *thermal;
 	unsigned int pp_tmp = DA9062_DEFAULT_POLLING_MS_PERIOD;
 	const struct of_device_id *match;
 	int ret = 0;

 	match = of_match_node(da9062_compatible_reg_id_table,
 			      pdev->dev.of_node);
 	if (!match)
 		return -ENXIO;

 	if (pdev->dev.of_node) {
 		if (!of_property_read_u32(pdev->dev.of_node,
 					  "polling-delay-passive",
 					  &pp_tmp)) {
 			if (pp_tmp < DA9062_MIN_POLLING_MS_PERIOD ||
 			    pp_tmp > DA9062_MAX_POLLING_MS_PERIOD) {
 				dev_warn(&pdev->dev,
 					 "Out-of-range polling period %d ms\n",
 					 pp_tmp);
 				pp_tmp = DA9062_DEFAULT_POLLING_MS_PERIOD;
 			}
 		}
 	}

 	thermal = devm_kzalloc(&pdev->dev, sizeof(struct da9062_thermal),
 			       GFP_KERNEL);
 	if (!thermal) {
 		ret = -ENOMEM;
 		goto err;
 	}

 	thermal->config = match->data;
 	thermal->hw = chip;
 	thermal->mode = THERMAL_DEVICE_ENABLED;
 	thermal->dev = &pdev->dev;

 	INIT_DELAYED_WORK(&thermal->work, da9062_thermal_poll_on);
 	mutex_init(&thermal->lock);

 	thermal->zone = thermal_zone_device_register(thermal->config->name,
 					1, 0, thermal,
 					&da9062_thermal_ops, NULL, pp_tmp,
 					0);
 	if (IS_ERR(thermal->zone)) {
 		dev_err(&pdev->dev, "Cannot register thermal zone device\n");
 		ret = PTR_ERR(thermal->zone);
 		goto err;
 	}

 	dev_dbg(&pdev->dev,
 		"TJUNC temperature polling period set at %d ms\n",
 		thermal->zone->passive_delay);

 	ret = platform_get_irq_byname(pdev, "THERMAL");
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to get platform IRQ.\n");
 		goto err_zone;
 	}
 	thermal->irq = ret;

 	ret = request_threaded_irq(thermal->irq, NULL,
 				   da9062_thermal_irq_handler,
 				   IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 				   "THERMAL", thermal);
 	if (ret) {
 		dev_err(&pdev->dev,
 			"Failed to request thermal device IRQ.\n");
 		goto err_zone;
 	}

 	platform_set_drvdata(pdev, thermal);
 	return 0;

 err_zone:
 	thermal_zone_device_unregister(thermal->zone);
 err:
 	return ret;
 }

 static int da9062_thermal_remove(struct platform_device *pdev)
 {
 	struct	da9062_thermal *thermal = platform_get_drvdata(pdev);

 	free_irq(thermal->irq, thermal);
 	cancel_delayed_work_sync(&thermal->work);
 	thermal_zone_device_unregister(thermal->zone);
 	return 0;
 }

 static struct platform_driver da9062_thermal_driver = {
 	.probe	= da9062_thermal_probe,
 	.remove	= da9062_thermal_remove,
 	.driver	= {
 		.name	= "da9062-thermal",
 		.of_match_table = da9062_compatible_reg_id_table,
 	},
 };

 module_platform_driver(da9062_thermal_driver);

 MODULE_AUTHOR("Steve Twiss");
 MODULE_DESCRIPTION("Thermal TJUNC device driver for Dialog DA9062 and DA9061");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:da9062-thermal");
	/*
	* Thermal device driver for DA9062 and DA9061
	* Copyright (C) 2017 Dialog Semiconductor
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version 2
	* of the License, or (at your option) any later version.
	*
	* 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.
	*/

	/* When over-temperature is reached, an interrupt from the device will be
	* triggered. Following this event the interrupt will be disabled and
	* periodic transmission of uevents (HOT trip point) should define the
	* first level of temperature supervision. It is expected that any final
	* implementation of the thermal driver will include a .notify() function
	* to implement these uevents to userspace.
	*
	* These uevents are intended to indicate non-invasive temperature control
	* of the system, where the necessary measures for cooling are the
	* responsibility of the host software. Once the temperature falls again,
	* the IRQ is re-enabled so the start of a new over-temperature event can
	* be detected without constant software monitoring.
	*/

	#include <linux/errno.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>
	#include <linux/thermal.h>
	#include <linux/workqueue.h>

	#include <linux/mfd/da9062/core.h>
	#include <linux/mfd/da9062/registers.h>

	/* Minimum, maximum and default polling millisecond periods are provided
	* here as an example. It is expected that any final implementation to also
	* include a modification of these settings to match the required
	* application.
	*/
	#define DA9062_DEFAULT_POLLING_MS_PERIOD 3000
	#define DA9062_MAX_POLLING_MS_PERIOD 10000
	#define DA9062_MIN_POLLING_MS_PERIOD 1000

	#define DA9062_MILLI_CELSIUS(t) ((t) * 1000)

	struct da9062_thermal_config {
	const char *name;
	};

	struct da9062_thermal {
	struct da9062 *hw;
	struct delayed_work work;
	struct thermal_zone_device *zone;
	enum thermal_device_mode mode;
	struct mutex lock; /* protection for da9062_thermal temperature */
	int temperature;
	int irq;
	const struct da9062_thermal_config *config;
	struct device *dev;
	};

	static void da9062_thermal_poll_on(struct work_struct *work)
	{
	struct da9062_thermal *thermal = container_of(work,
	struct da9062_thermal,
	work.work);
	unsigned long delay;
	unsigned int val;
	int ret;

	/* clear E_TEMP */
	ret = regmap_write(thermal->hw->regmap,
	DA9062AA_EVENT_B,
	DA9062AA_E_TEMP_MASK);
	if (ret < 0) {
	dev_err(thermal->dev,
	"Cannot clear the TJUNC temperature status\n");
	goto err_enable_irq;
	}

	/* Now read E_TEMP again: it is acting like a status bit.
	* If over-temperature, then this status will be true.
	* If not over-temperature, this status will be false.
	*/
	ret = regmap_read(thermal->hw->regmap,
	DA9062AA_EVENT_B,
	&val);
	if (ret < 0) {
	dev_err(thermal->dev,
	"Cannot check the TJUNC temperature status\n");
	goto err_enable_irq;
	}

	if (val & DA9062AA_E_TEMP_MASK) {
	mutex_lock(&thermal->lock);
	thermal->temperature = DA9062_MILLI_CELSIUS(125);
	mutex_unlock(&thermal->lock);
	thermal_zone_device_update(thermal->zone,
	THERMAL_EVENT_UNSPECIFIED);

	delay = msecs_to_jiffies(thermal->zone->passive_delay);
	queue_delayed_work(system_freezable_wq, &thermal->work, delay);
	return;
	}

	mutex_lock(&thermal->lock);
	thermal->temperature = DA9062_MILLI_CELSIUS(0);
	mutex_unlock(&thermal->lock);
	thermal_zone_device_update(thermal->zone,
	THERMAL_EVENT_UNSPECIFIED);

	err_enable_irq:
	enable_irq(thermal->irq);
	}

	static irqreturn_t da9062_thermal_irq_handler(int irq, void *data)
	{
	struct da9062_thermal *thermal = data;

	disable_irq_nosync(thermal->irq);
	queue_delayed_work(system_freezable_wq, &thermal->work, 0);

	return IRQ_HANDLED;
	}

	static int da9062_thermal_get_mode(struct thermal_zone_device *z,
	enum thermal_device_mode *mode)
	{
	struct da9062_thermal *thermal = z->devdata;
	*mode = thermal->mode;
	return 0;
	}

	static int da9062_thermal_get_trip_type(struct thermal_zone_device *z,
	int trip,
	enum thermal_trip_type *type)
	{
	struct da9062_thermal *thermal = z->devdata;

	switch (trip) {
	case 0:
	*type = THERMAL_TRIP_HOT;
	break;
	default:
	dev_err(thermal->dev,
	"Driver does not support more than 1 trip-wire\n");
	return -EINVAL;
	}

	return 0;
	}

	static int da9062_thermal_get_trip_temp(struct thermal_zone_device *z,
	int trip,
	int *temp)
	{
	struct da9062_thermal *thermal = z->devdata;

	switch (trip) {
	case 0:
	*temp = DA9062_MILLI_CELSIUS(125);
	break;
	default:
	dev_err(thermal->dev,
	"Driver does not support more than 1 trip-wire\n");
	return -EINVAL;
	}

	return 0;
	}

	static int da9062_thermal_get_temp(struct thermal_zone_device *z,
	int *temp)
	{
	struct da9062_thermal *thermal = z->devdata;

	mutex_lock(&thermal->lock);
	*temp = thermal->temperature;
	mutex_unlock(&thermal->lock);

	return 0;
	}

	static struct thermal_zone_device_ops da9062_thermal_ops = {
	.get_temp = da9062_thermal_get_temp,
	.get_mode = da9062_thermal_get_mode,
	.get_trip_type = da9062_thermal_get_trip_type,
	.get_trip_temp = da9062_thermal_get_trip_temp,
	};

	static const struct da9062_thermal_config da9062_config = {
	.name = "da9062-thermal",
	};

	static const struct of_device_id da9062_compatible_reg_id_table[] = {
	{ .compatible = "dlg,da9062-thermal", .data = &da9062_config },
	{ },
	};

	MODULE_DEVICE_TABLE(of, da9062_compatible_reg_id_table);

	static int da9062_thermal_probe(struct platform_device *pdev)
	{
	struct da9062 *chip = dev_get_drvdata(pdev->dev.parent);
	struct da9062_thermal *thermal;
	unsigned int pp_tmp = DA9062_DEFAULT_POLLING_MS_PERIOD;
	const struct of_device_id *match;
	int ret = 0;

	match = of_match_node(da9062_compatible_reg_id_table,
	pdev->dev.of_node);
	if (!match)
	return -ENXIO;

	if (pdev->dev.of_node) {
	if (!of_property_read_u32(pdev->dev.of_node,
	"polling-delay-passive",
	&pp_tmp)) {
	if (pp_tmp < DA9062_MIN_POLLING_MS_PERIOD \|\|
	pp_tmp > DA9062_MAX_POLLING_MS_PERIOD) {
	dev_warn(&pdev->dev,
	"Out-of-range polling period %d ms\n",
	pp_tmp);
	pp_tmp = DA9062_DEFAULT_POLLING_MS_PERIOD;
	}
	}
	}

	thermal = devm_kzalloc(&pdev->dev, sizeof(struct da9062_thermal),
	GFP_KERNEL);
	if (!thermal) {
	ret = -ENOMEM;
	goto err;
	}

	thermal->config = match->data;
	thermal->hw = chip;
	thermal->mode = THERMAL_DEVICE_ENABLED;
	thermal->dev = &pdev->dev;

	INIT_DELAYED_WORK(&thermal->work, da9062_thermal_poll_on);
	mutex_init(&thermal->lock);

	thermal->zone = thermal_zone_device_register(thermal->config->name,
	1, 0, thermal,
	&da9062_thermal_ops, NULL, pp_tmp,
	0);
	if (IS_ERR(thermal->zone)) {
	dev_err(&pdev->dev, "Cannot register thermal zone device\n");
	ret = PTR_ERR(thermal->zone);
	goto err;
	}

	dev_dbg(&pdev->dev,
	"TJUNC temperature polling period set at %d ms\n",
	thermal->zone->passive_delay);

	ret = platform_get_irq_byname(pdev, "THERMAL");
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to get platform IRQ.\n");
	goto err_zone;
	}
	thermal->irq = ret;

	ret = request_threaded_irq(thermal->irq, NULL,
	da9062_thermal_irq_handler,
	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	"THERMAL", thermal);
	if (ret) {
	dev_err(&pdev->dev,
	"Failed to request thermal device IRQ.\n");
	goto err_zone;
	}

	platform_set_drvdata(pdev, thermal);
	return 0;

	err_zone:
	thermal_zone_device_unregister(thermal->zone);
	err:
	return ret;
	}

	static int da9062_thermal_remove(struct platform_device *pdev)
	{
	struct da9062_thermal *thermal = platform_get_drvdata(pdev);

	free_irq(thermal->irq, thermal);
	cancel_delayed_work_sync(&thermal->work);
	thermal_zone_device_unregister(thermal->zone);
	return 0;
	}

	static struct platform_driver da9062_thermal_driver = {
	.probe = da9062_thermal_probe,
	.remove = da9062_thermal_remove,
	.driver = {
	.name = "da9062-thermal",
	.of_match_table = da9062_compatible_reg_id_table,
	},
	};

	module_platform_driver(da9062_thermal_driver);

	MODULE_AUTHOR("Steve Twiss");
	MODULE_DESCRIPTION("Thermal TJUNC device driver for Dialog DA9062 and DA9061");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:da9062-thermal");