120 lines
2.8 KiB
C
120 lines
2.8 KiB
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(void *data, int *temp)
|
|
{
|
|
struct bcm2711_thermal_priv *priv = data;
|
|
int slope = thermal_zone_get_slope(priv->thermal);
|
|
int offset = thermal_zone_get_offset(priv->thermal);
|
|
u32 val;
|
|
int ret;
|
|
long t;
|
|
|
|
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) */
|
|
t = slope * val + offset;
|
|
|
|
*temp = t < 0 ? 0 : t;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct thermal_zone_of_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_zone_of_sensor_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");
|