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5f68d0785e
The thermal zone device structure is exposed to the different drivers and obviously they access the internals while that should be restricted to the core thermal code. In order to self-encapsulate the thermal core code, we need to prevent the drivers accessing directly the thermal zone structure and provide accessor functions to deal with. Use the devdata accessor introduced in the previous patch. No functional changes intended. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> #R-Car Acked-by: Mark Brown <broonie@kernel.org> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> #MediaTek auxadc and lvts Reviewed-by: Balsam CHIHI <bchihi@baylibre.com> #Mediatek lvts Reviewed-by: Adam Ward <DLG-Adam.Ward.opensource@dm.renesas.com> #da9062 Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com> #spread Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com> #sun8i_thermal Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Florian Fainelli <f.fainelli@gmail.com> #Broadcom Reviewed-by: Dhruva Gole <d-gole@ti.com> # K3 bandgap Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Heiko Stuebner <heiko@sntech.de> #rockchip Reviewed-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com> #uniphier Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
116 lines
2.7 KiB
C
116 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*/
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/thermal.h>
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struct thermal_mmio {
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void __iomem *mmio_base;
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u32 (*read_mmio)(void __iomem *mmio_base);
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u32 mask;
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int factor;
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};
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static u32 thermal_mmio_readb(void __iomem *mmio_base)
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{
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return readb(mmio_base);
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}
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static int thermal_mmio_get_temperature(struct thermal_zone_device *tz, int *temp)
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{
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int t;
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struct thermal_mmio *sensor = thermal_zone_device_priv(tz);
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t = sensor->read_mmio(sensor->mmio_base) & sensor->mask;
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t *= sensor->factor;
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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_device_ops thermal_mmio_ops = {
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.get_temp = thermal_mmio_get_temperature,
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};
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static int thermal_mmio_probe(struct platform_device *pdev)
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{
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struct thermal_mmio *sensor;
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int (*sensor_init_func)(struct platform_device *pdev,
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struct thermal_mmio *sensor);
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struct thermal_zone_device *thermal_zone;
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int ret;
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int temperature;
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sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
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if (!sensor)
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return -ENOMEM;
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sensor->mmio_base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
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if (IS_ERR(sensor->mmio_base))
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return PTR_ERR(sensor->mmio_base);
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sensor_init_func = device_get_match_data(&pdev->dev);
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if (sensor_init_func) {
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ret = sensor_init_func(pdev, sensor);
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if (ret) {
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dev_err(&pdev->dev,
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"failed to initialize sensor (%d)\n",
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ret);
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return ret;
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}
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}
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thermal_zone = devm_thermal_of_zone_register(&pdev->dev,
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0,
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sensor,
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&thermal_mmio_ops);
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if (IS_ERR(thermal_zone)) {
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dev_err(&pdev->dev,
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"failed to register sensor (%ld)\n",
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PTR_ERR(thermal_zone));
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return PTR_ERR(thermal_zone);
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}
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thermal_mmio_get_temperature(thermal_zone, &temperature);
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dev_info(&pdev->dev,
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"thermal mmio sensor %s registered, current temperature: %d\n",
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pdev->name, temperature);
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return 0;
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}
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static int al_thermal_init(struct platform_device *pdev,
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struct thermal_mmio *sensor)
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{
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sensor->read_mmio = thermal_mmio_readb;
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sensor->mask = 0xff;
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sensor->factor = 1000;
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return 0;
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}
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static const struct of_device_id thermal_mmio_id_table[] = {
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{ .compatible = "amazon,al-thermal", .data = al_thermal_init},
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{}
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};
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MODULE_DEVICE_TABLE(of, thermal_mmio_id_table);
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static struct platform_driver thermal_mmio_driver = {
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.probe = thermal_mmio_probe,
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.driver = {
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.name = "thermal-mmio",
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.of_match_table = thermal_mmio_id_table,
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},
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};
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module_platform_driver(thermal_mmio_driver);
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MODULE_AUTHOR("Talel Shenhar <talel@amazon.com>");
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MODULE_DESCRIPTION("Thermal MMIO Driver");
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MODULE_LICENSE("GPL v2");
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