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f6a756e8fb
The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Signed-off-by: Rob Herring <robh@kernel.org> Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
116 lines
2.8 KiB
C
116 lines
2.8 KiB
C
// 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/of.h>
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#include <linux/platform_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(struct thermal_zone_device *tz, int *temp)
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{
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struct bcm2711_thermal_priv *priv = thermal_zone_device_priv(tz);
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int slope = thermal_zone_get_slope(tz);
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int offset = thermal_zone_get_offset(tz);
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u32 val;
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int ret;
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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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*temp = slope * val + offset;
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return 0;
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}
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static const struct thermal_zone_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_of_zone_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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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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