[linux-block.git] / drivers / thermal / broadcom / bcm2711_thermal.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Broadcom AVS RO thermal sensor driver
 *
 * based on brcmstb_thermal
 *
 * Copyright (C) 2020 Stefan Wahren
 */

#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/thermal.h>

#include "../thermal_hwmon.h"

#define AVS_RO_TEMP_STATUS		0x200
#define AVS_RO_TEMP_STATUS_VALID_MSK	(BIT(16) | BIT(10))
#define AVS_RO_TEMP_STATUS_DATA_MSK	GENMASK(9, 0)

struct bcm2711_thermal_priv {
	struct regmap *regmap;
	struct thermal_zone_device *thermal;
};

static int bcm2711_get_temp(struct thermal_zone_device *tz, int *temp)
{
	struct bcm2711_thermal_priv *priv = thermal_zone_device_priv(tz);
	int slope = thermal_zone_get_slope(tz);
	int offset = thermal_zone_get_offset(tz);
	u32 val;
	int ret;

	ret = regmap_read(priv->regmap, AVS_RO_TEMP_STATUS, &val);
	if (ret)
		return ret;

	if (!(val & AVS_RO_TEMP_STATUS_VALID_MSK))
		return -EIO;

	val &= AVS_RO_TEMP_STATUS_DATA_MSK;

	/* Convert a HW code to a temperature reading (millidegree celsius) */
	*temp = slope * val + offset;

	return 0;
}

static const struct thermal_zone_device_ops bcm2711_thermal_of_ops = {
	.get_temp	= bcm2711_get_temp,
};

static const struct of_device_id bcm2711_thermal_id_table[] = {
	{ .compatible = "brcm,bcm2711-thermal" },
	{},
};
MODULE_DEVICE_TABLE(of, bcm2711_thermal_id_table);

static int bcm2711_thermal_probe(struct platform_device *pdev)
{
	struct thermal_zone_device *thermal;
	struct bcm2711_thermal_priv *priv;
	struct device *dev = &pdev->dev;
	struct device_node *parent;
	struct regmap *regmap;
	int ret;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	/* get regmap from syscon node */
	parent = of_get_parent(dev->of_node); /* parent should be syscon node */
	regmap = syscon_node_to_regmap(parent);
	of_node_put(parent);
	if (IS_ERR(regmap)) {
		ret = PTR_ERR(regmap);
		dev_err(dev, "failed to get regmap: %d\n", ret);
		return ret;
	}
	priv->regmap = regmap;

	thermal = devm_thermal_of_zone_register(dev, 0, priv,
						&bcm2711_thermal_of_ops);
	if (IS_ERR(thermal)) {
		ret = PTR_ERR(thermal);
		dev_err(dev, "could not register sensor: %d\n", ret);
		return ret;
	}

	priv->thermal = thermal;

	thermal->tzp->no_hwmon = false;
	return thermal_add_hwmon_sysfs(thermal);
}

static struct platform_driver bcm2711_thermal_driver = {
	.probe = bcm2711_thermal_probe,
	.driver = {
		.name = "bcm2711_thermal",
		.of_match_table = bcm2711_thermal_id_table,
	},
};
module_platform_driver(bcm2711_thermal_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Stefan Wahren");
MODULE_DESCRIPTION("Broadcom AVS RO thermal sensor driver");
Commit	Line	Data
59b78135 SW	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* Broadcom AVS RO thermal sensor driver
	4	*
	5	* based on brcmstb_thermal
	6	*
	7	* Copyright (C) 2020 Stefan Wahren
	8	*/
	9
	10	#include <linux/bitops.h>
	11	#include <linux/clk.h>
	12	#include <linux/device.h>
	13	#include <linux/err.h>
	14	#include <linux/io.h>
	15	#include <linux/kernel.h>
	16	#include <linux/mfd/syscon.h>
	17	#include <linux/module.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/of_device.h>
	20	#include <linux/regmap.h>
	21	#include <linux/thermal.h>
	22
	23	#include "../thermal_hwmon.h"
	24
	25	#define AVS_RO_TEMP_STATUS 0x200
	26	#define AVS_RO_TEMP_STATUS_VALID_MSK (BIT(16) \| BIT(10))
	27	#define AVS_RO_TEMP_STATUS_DATA_MSK GENMASK(9, 0)
	28
	29	struct bcm2711_thermal_priv {
	30	struct regmap *regmap;
	31	struct thermal_zone_device *thermal;
	32	};
	33
944441d8	34	static int bcm2711_get_temp(struct thermal_zone_device tz, int temp)
59b78135	35	{
5f68d078	36	struct bcm2711_thermal_priv *priv = thermal_zone_device_priv(tz);
944441d8 DL	37	int slope = thermal_zone_get_slope(tz);
944441d8 DL	38	int offset = thermal_zone_get_offset(tz);
59b78135 SW	39	u32 val;
59b78135 SW	40	int ret;
59b78135 SW	41
	42	ret = regmap_read(priv->regmap, AVS_RO_TEMP_STATUS, &val);
	43	if (ret)
	44	return ret;
	45
	46	if (!(val & AVS_RO_TEMP_STATUS_VALID_MSK))
	47	return -EIO;
	48
	49	val &= AVS_RO_TEMP_STATUS_DATA_MSK;
	50
	51	/* Convert a HW code to a temperature reading (millidegree celsius) */
106e0121	52	temp = slope val + offset;
59b78135 SW	53
	54	return 0;
	55	}
	56
944441d8	57	static const struct thermal_zone_device_ops bcm2711_thermal_of_ops = {
59b78135 SW	58	.get_temp = bcm2711_get_temp,
	59	};
	60
	61	static const struct of_device_id bcm2711_thermal_id_table[] = {
	62	{ .compatible = "brcm,bcm2711-thermal" },
	63	{},
	64	};
	65	MODULE_DEVICE_TABLE(of, bcm2711_thermal_id_table);
	66
	67	static int bcm2711_thermal_probe(struct platform_device *pdev)
	68	{
	69	struct thermal_zone_device *thermal;
	70	struct bcm2711_thermal_priv *priv;
	71	struct device *dev = &pdev->dev;
	72	struct device_node *parent;
	73	struct regmap *regmap;
	74	int ret;
	75
	76	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	77	if (!priv)
	78	return -ENOMEM;
	79
	80	/* get regmap from syscon node */
	81	parent = of_get_parent(dev->of_node); /* parent should be syscon node */
	82	regmap = syscon_node_to_regmap(parent);
	83	of_node_put(parent);
	84	if (IS_ERR(regmap)) {
	85	ret = PTR_ERR(regmap);
	86	dev_err(dev, "failed to get regmap: %d\n", ret);
	87	return ret;
	88	}
	89	priv->regmap = regmap;
	90
944441d8 DL	91	thermal = devm_thermal_of_zone_register(dev, 0, priv,
944441d8 DL	92	&bcm2711_thermal_of_ops);
59b78135 SW	93	if (IS_ERR(thermal)) {
	94	ret = PTR_ERR(thermal);
	95	dev_err(dev, "could not register sensor: %d\n", ret);
	96	return ret;
	97	}
	98
	99	priv->thermal = thermal;
	100
	101	thermal->tzp->no_hwmon = false;
ea21f589	102	return thermal_add_hwmon_sysfs(thermal);
59b78135 SW	103	}
	104
	105	static struct platform_driver bcm2711_thermal_driver = {
	106	.probe = bcm2711_thermal_probe,
	107	.driver = {
	108	.name = "bcm2711_thermal",
	109	.of_match_table = bcm2711_thermal_id_table,
	110	},
	111	};
	112	module_platform_driver(bcm2711_thermal_driver);
	113
	114	MODULE_LICENSE("GPL");
	115	MODULE_AUTHOR("Stefan Wahren");
	116	MODULE_DESCRIPTION("Broadcom AVS RO thermal sensor driver");