124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Broadcom AVS RO thermal sensor driver
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*
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* based on brcmstb_thermal
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*
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* Copyright (C) 2020 Stefan Wahren
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*/
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#include <linux/bitops.h>
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#include <linux/thermal.h>
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#include "../thermal_hwmon.h"
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#define AVS_RO_TEMP_STATUS 0x200
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#define AVS_RO_TEMP_STATUS_VALID_MSK (BIT(16) | BIT(10))
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#define AVS_RO_TEMP_STATUS_DATA_MSK GENMASK(9, 0)
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struct bcm2711_thermal_priv {
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struct regmap *regmap;
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struct thermal_zone_device *thermal;
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};
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static int bcm2711_get_temp(void *data, int *temp)
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{
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struct bcm2711_thermal_priv *priv = data;
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int slope = thermal_zone_get_slope(priv->thermal);
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int offset = thermal_zone_get_offset(priv->thermal);
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u32 val;
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int ret;
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long t;
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ret = regmap_read(priv->regmap, AVS_RO_TEMP_STATUS, &val);
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if (ret)
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return ret;
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if (!(val & AVS_RO_TEMP_STATUS_VALID_MSK))
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return -EIO;
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val &= AVS_RO_TEMP_STATUS_DATA_MSK;
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/* Convert a HW code to a temperature reading (millidegree celsius) */
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t = slope * val + offset;
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*temp = t < 0 ? 0 : t;
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return 0;
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}
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static const struct thermal_zone_of_device_ops bcm2711_thermal_of_ops = {
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.get_temp = bcm2711_get_temp,
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};
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static const struct of_device_id bcm2711_thermal_id_table[] = {
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{ .compatible = "brcm,bcm2711-thermal" },
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{},
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};
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MODULE_DEVICE_TABLE(of, bcm2711_thermal_id_table);
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static int bcm2711_thermal_probe(struct platform_device *pdev)
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{
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struct thermal_zone_device *thermal;
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struct bcm2711_thermal_priv *priv;
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struct device *dev = &pdev->dev;
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struct device_node *parent;
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struct regmap *regmap;
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int ret;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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/* get regmap from syscon node */
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parent = of_get_parent(dev->of_node); /* parent should be syscon node */
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regmap = syscon_node_to_regmap(parent);
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of_node_put(parent);
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if (IS_ERR(regmap)) {
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ret = PTR_ERR(regmap);
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dev_err(dev, "failed to get regmap: %d\n", ret);
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return ret;
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}
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priv->regmap = regmap;
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thermal = devm_thermal_zone_of_sensor_register(dev, 0, priv,
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&bcm2711_thermal_of_ops);
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if (IS_ERR(thermal)) {
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ret = PTR_ERR(thermal);
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dev_err(dev, "could not register sensor: %d\n", ret);
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return ret;
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}
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priv->thermal = thermal;
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thermal->tzp->no_hwmon = false;
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ret = thermal_add_hwmon_sysfs(thermal);
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if (ret)
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return ret;
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return 0;
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}
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static struct platform_driver bcm2711_thermal_driver = {
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.probe = bcm2711_thermal_probe,
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.driver = {
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.name = "bcm2711_thermal",
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.of_match_table = bcm2711_thermal_id_table,
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},
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};
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module_platform_driver(bcm2711_thermal_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Stefan Wahren");
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MODULE_DESCRIPTION("Broadcom AVS RO thermal sensor driver");
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