[linux-block.git] / drivers / thermal / max77620_thermal.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Junction temperature thermal driver for Maxim Max77620.
 *
 * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
 *
 * Author: Laxman Dewangan <ldewangan@nvidia.com>
 *	   Mallikarjun Kasoju <mkasoju@nvidia.com>
 */

#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/mfd/max77620.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/thermal.h>

#define MAX77620_NORMAL_OPERATING_TEMP	100000
#define MAX77620_TJALARM1_TEMP		120000
#define MAX77620_TJALARM2_TEMP		140000

struct max77620_therm_info {
	struct device			*dev;
	struct regmap			*rmap;
	struct thermal_zone_device	*tz_device;
	int				irq_tjalarm1;
	int				irq_tjalarm2;
};

/**
 * max77620_thermal_read_temp: Read PMIC die temperatue.
 * @data:	Device specific data.
 * @temp:	Temperature in millidegrees Celsius
 *
 * The actual temperature of PMIC die is not available from PMIC.
 * PMIC only tells the status if it has crossed or not the threshold level
 * of 120degC or 140degC.
 * If threshold has not been crossed then assume die temperature as 100degC
 * else 120degC or 140deG based on the PMIC die temp threshold status.
 *
 * Return 0 on success otherwise error number to show reason of failure.
 */

static int max77620_thermal_read_temp(struct thermal_zone_device *tz, int *temp)
{
	struct max77620_therm_info *mtherm = thermal_zone_device_priv(tz);
	unsigned int val;
	int ret;

	ret = regmap_read(mtherm->rmap, MAX77620_REG_STATLBT, &val);
	if (ret < 0)
		return ret;

	if (val & MAX77620_IRQ_TJALRM2_MASK)
		*temp = MAX77620_TJALARM2_TEMP;
	else if (val & MAX77620_IRQ_TJALRM1_MASK)
		*temp = MAX77620_TJALARM1_TEMP;
	else
		*temp = MAX77620_NORMAL_OPERATING_TEMP;

	return 0;
}

static const struct thermal_zone_device_ops max77620_thermal_ops = {
	.get_temp = max77620_thermal_read_temp,
};

static irqreturn_t max77620_thermal_irq(int irq, void *data)
{
	struct max77620_therm_info *mtherm = data;

	if (irq == mtherm->irq_tjalarm1)
		dev_warn(mtherm->dev, "Junction Temp Alarm1(120C) occurred\n");
	else if (irq == mtherm->irq_tjalarm2)
		dev_crit(mtherm->dev, "Junction Temp Alarm2(140C) occurred\n");

	thermal_zone_device_update(mtherm->tz_device,
				   THERMAL_EVENT_UNSPECIFIED);

	return IRQ_HANDLED;
}

static int max77620_thermal_probe(struct platform_device *pdev)
{
	struct max77620_therm_info *mtherm;
	int ret;

	mtherm = devm_kzalloc(&pdev->dev, sizeof(*mtherm), GFP_KERNEL);
	if (!mtherm)
		return -ENOMEM;

	mtherm->irq_tjalarm1 = platform_get_irq(pdev, 0);
	mtherm->irq_tjalarm2 = platform_get_irq(pdev, 1);
	if ((mtherm->irq_tjalarm1 < 0) || (mtherm->irq_tjalarm2 < 0)) {
		dev_err(&pdev->dev, "Alarm irq number not available\n");
		return -EINVAL;
	}

	mtherm->dev = &pdev->dev;
	mtherm->rmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!mtherm->rmap) {
		dev_err(&pdev->dev, "Failed to get parent regmap\n");
		return -ENODEV;
	}

	/*
	 * The reference taken to the parent's node which will be balanced on
	 * reprobe or on platform-device release.
	 */
	device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);

	mtherm->tz_device = devm_thermal_of_zone_register(&pdev->dev, 0,
				mtherm, &max77620_thermal_ops);
	if (IS_ERR(mtherm->tz_device)) {
		ret = PTR_ERR(mtherm->tz_device);
		dev_err(&pdev->dev, "Failed to register thermal zone: %d\n",
			ret);
		return ret;
	}

	ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm1, NULL,
					max77620_thermal_irq,
					IRQF_ONESHOT | IRQF_SHARED,
					dev_name(&pdev->dev), mtherm);
	if (ret < 0) {
		dev_err(&pdev->dev, "Failed to request irq1: %d\n", ret);
		return ret;
	}

	ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm2, NULL,
					max77620_thermal_irq,
					IRQF_ONESHOT | IRQF_SHARED,
					dev_name(&pdev->dev), mtherm);
	if (ret < 0) {
		dev_err(&pdev->dev, "Failed to request irq2: %d\n", ret);
		return ret;
	}

	platform_set_drvdata(pdev, mtherm);

	return 0;
}

static struct platform_device_id max77620_thermal_devtype[] = {
	{ .name = "max77620-thermal", },
	{},
};
MODULE_DEVICE_TABLE(platform, max77620_thermal_devtype);

static struct platform_driver max77620_thermal_driver = {
	.driver = {
		.name = "max77620-thermal",
	},
	.probe = max77620_thermal_probe,
	.id_table = max77620_thermal_devtype,
};

module_platform_driver(max77620_thermal_driver);

MODULE_DESCRIPTION("Max77620 Junction temperature Thermal driver");
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
MODULE_AUTHOR("Mallikarjun Kasoju <mkasoju@nvidia.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
75a6faf6	1	// SPDX-License-Identifier: GPL-2.0-only
ec4664b3 LD	2	/*
	3	* Junction temperature thermal driver for Maxim Max77620.
	4	*
	5	* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
	6	*
	7	* Author: Laxman Dewangan <ldewangan@nvidia.com>
	8	* Mallikarjun Kasoju <mkasoju@nvidia.com>
ec4664b3 LD	9	*/
	10
	11	#include <linux/irq.h>
	12	#include <linux/interrupt.h>
	13	#include <linux/mfd/max77620.h>
	14	#include <linux/module.h>
	15	#include <linux/of.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/regmap.h>
	18	#include <linux/slab.h>
	19	#include <linux/thermal.h>
	20
	21	#define MAX77620_NORMAL_OPERATING_TEMP 100000
	22	#define MAX77620_TJALARM1_TEMP 120000
	23	#define MAX77620_TJALARM2_TEMP 140000
	24
	25	struct max77620_therm_info {
	26	struct device *dev;
	27	struct regmap *rmap;
	28	struct thermal_zone_device *tz_device;
	29	int irq_tjalarm1;
	30	int irq_tjalarm2;
	31	};
	32
	33	/**
	34	* max77620_thermal_read_temp: Read PMIC die temperatue.
	35	* @data: Device specific data.
0f43e646	36	* @temp: Temperature in millidegrees Celsius
ec4664b3 LD	37	*
	38	* The actual temperature of PMIC die is not available from PMIC.
	39	* PMIC only tells the status if it has crossed or not the threshold level
	40	* of 120degC or 140degC.
	41	* If threshold has not been crossed then assume die temperature as 100degC
	42	* else 120degC or 140deG based on the PMIC die temp threshold status.
	43	*
	44	* Return 0 on success otherwise error number to show reason of failure.
	45	*/
	46
ae11d6a8	47	static int max77620_thermal_read_temp(struct thermal_zone_device tz, int temp)
ec4664b3	48	{
5f68d078	49	struct max77620_therm_info *mtherm = thermal_zone_device_priv(tz);
ec4664b3 LD	50	unsigned int val;
	51	int ret;
	52
	53	ret = regmap_read(mtherm->rmap, MAX77620_REG_STATLBT, &val);
abda7383	54	if (ret < 0)
ec4664b3	55	return ret;
ec4664b3 LD	56
	57	if (val & MAX77620_IRQ_TJALRM2_MASK)
	58	*temp = MAX77620_TJALARM2_TEMP;
	59	else if (val & MAX77620_IRQ_TJALRM1_MASK)
	60	*temp = MAX77620_TJALARM1_TEMP;
	61	else
	62	*temp = MAX77620_NORMAL_OPERATING_TEMP;
	63
	64	return 0;
	65	}
	66
ae11d6a8	67	static const struct thermal_zone_device_ops max77620_thermal_ops = {
ec4664b3 LD	68	.get_temp = max77620_thermal_read_temp,
	69	};
	70
	71	static irqreturn_t max77620_thermal_irq(int irq, void *data)
	72	{
	73	struct max77620_therm_info *mtherm = data;
	74
	75	if (irq == mtherm->irq_tjalarm1)
	76	dev_warn(mtherm->dev, "Junction Temp Alarm1(120C) occurred\n");
	77	else if (irq == mtherm->irq_tjalarm2)
	78	dev_crit(mtherm->dev, "Junction Temp Alarm2(140C) occurred\n");
	79
0e70f466 SP	80	thermal_zone_device_update(mtherm->tz_device,
0e70f466 SP	81	THERMAL_EVENT_UNSPECIFIED);
ec4664b3 LD	82
	83	return IRQ_HANDLED;
	84	}
	85
	86	static int max77620_thermal_probe(struct platform_device *pdev)
	87	{
	88	struct max77620_therm_info *mtherm;
	89	int ret;
	90
	91	mtherm = devm_kzalloc(&pdev->dev, sizeof(*mtherm), GFP_KERNEL);
	92	if (!mtherm)
	93	return -ENOMEM;
	94
	95	mtherm->irq_tjalarm1 = platform_get_irq(pdev, 0);
	96	mtherm->irq_tjalarm2 = platform_get_irq(pdev, 1);
	97	if ((mtherm->irq_tjalarm1 < 0) \|\| (mtherm->irq_tjalarm2 < 0)) {
	98	dev_err(&pdev->dev, "Alarm irq number not available\n");
	99	return -EINVAL;
	100	}
	101
ec4664b3 LD	102	mtherm->dev = &pdev->dev;
	103	mtherm->rmap = dev_get_regmap(pdev->dev.parent, NULL);
	104	if (!mtherm->rmap) {
	105	dev_err(&pdev->dev, "Failed to get parent regmap\n");
	106	return -ENODEV;
	107	}
	108
c592fafb	109	/*
ce046e5d JH	110	* The reference taken to the parent's node which will be balanced on
ce046e5d JH	111	* reprobe or on platform-device release.
c592fafb	112	*/
ce046e5d	113	device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
c592fafb	114
ae11d6a8	115	mtherm->tz_device = devm_thermal_of_zone_register(&pdev->dev, 0,
ec4664b3 LD	116	mtherm, &max77620_thermal_ops);
	117	if (IS_ERR(mtherm->tz_device)) {
	118	ret = PTR_ERR(mtherm->tz_device);
	119	dev_err(&pdev->dev, "Failed to register thermal zone: %d\n",
	120	ret);
	121	return ret;
	122	}
	123
	124	ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm1, NULL,
	125	max77620_thermal_irq,
	126	IRQF_ONESHOT \| IRQF_SHARED,
	127	dev_name(&pdev->dev), mtherm);
	128	if (ret < 0) {
	129	dev_err(&pdev->dev, "Failed to request irq1: %d\n", ret);
	130	return ret;
	131	}
	132
	133	ret = devm_request_threaded_irq(&pdev->dev, mtherm->irq_tjalarm2, NULL,
	134	max77620_thermal_irq,
	135	IRQF_ONESHOT \| IRQF_SHARED,
	136	dev_name(&pdev->dev), mtherm);
	137	if (ret < 0) {
	138	dev_err(&pdev->dev, "Failed to request irq2: %d\n", ret);
	139	return ret;
	140	}
	141
	142	platform_set_drvdata(pdev, mtherm);
	143
	144	return 0;
	145	}
	146
	147	static struct platform_device_id max77620_thermal_devtype[] = {
	148	{ .name = "max77620-thermal", },
	149	{},
	150	};
3f2883e5	151	MODULE_DEVICE_TABLE(platform, max77620_thermal_devtype);
ec4664b3 LD	152
	153	static struct platform_driver max77620_thermal_driver = {
	154	.driver = {
	155	.name = "max77620-thermal",
	156	},
	157	.probe = max77620_thermal_probe,
	158	.id_table = max77620_thermal_devtype,
	159	};
	160
	161	module_platform_driver(max77620_thermal_driver);
	162
	163	MODULE_DESCRIPTION("Max77620 Junction temperature Thermal driver");
	164	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
	165	MODULE_AUTHOR("Mallikarjun Kasoju <mkasoju@nvidia.com>");
	166	MODULE_LICENSE("GPL v2");