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119 lines
2.8 KiB
119 lines
2.8 KiB
// 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; |
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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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return thermal_add_hwmon_sysfs(thermal); |
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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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